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jeever 26/05/2024
Testing this device yielded the pleasant surprise that this TPS305 is a very good performing power supply for the money you have to pay for it. We can think of very few criticisms. Obviously, professional electronics engineers will turn their noses up at a power supply that delivers a rms-ripple of around 30 mV at full load. But don't forget that this ripple drops to 6.5 mV if you reduce the current from full load (5 A) to 4.0 A. We think that this is an excellent value. Also, the fact that in all our tests no overshoots, spikes or oscillations of any kind occurred on the output voltage argues in favour of the designers of this power supply. We have tested several power supplies in the same price range where this was anything but the case. For any hobbyist about to purchase a universal lab power supply, we think the TPS305 is an excellent choice.
WANPTEK Laboratóriumi Padló Tápellátás 150W 300W 360W Laboratóriumi Switch Tápellátási Egység 30V 60V 120V 3A 5A 10A Állítható Digitális Feszültségstabilizátor EU Dugó
US$78.00 US$158.00
5
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jeever 05/04/2023
We would call the S1 a 'fashion conscious' multimeter. 'Fashion conscious' because the design goes along with the trend of hand-held devices resembling a smartphone. However, is the S1 worth its price? For thesame price, you can buy a lot of multimeters that measure currents and have a 'REL' function and/or a 'MIN/MAX' function. Moreover, there are meters that have a more sensitive range than 9.999 V. The only extra useful thing about the S1 is its rechargeable battery, as most multimeters work with non-rechargeable batteries that sometimes run out of power at the most undesirable times. A wall outlet and a USB charger can always be found near the measurements. In terms of measurement accuracy, the S1 meets most of its specifications. You can trust this device to measure voltages, resistances and frequencies almost flawlessly. But that too is a feature that many identically priced meters have. So FNIRSI's S1 will be purchased mainly for its fashionable appearance. Indeed, we can imagine that a lot of technicians will fall in love with this nice-to-handle, smartphone-like and easy-to-operate little meter and would love to get it as their second (or third) multimeter for that affordable price.
FNIRSI-S1 9999 számláló digitális multiméter AC DC feszültség ellenállás kapacitás Dióda NCV Hertz Live Wire teszter termokupallal
US$28.49 US$29.99
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jeever 18/03/2024
The FNIRSI 1014D will undoubtedly not earn praise from professional electronicians. For that, its real bandwidth (30 MHz) is too small and its real rise time (11.5 ns) too large. But if you are looking for a very affordable and easy-to-operate entry-level model, this oscilloscope suffices perfectly. Its strengths obviously do not lie in performing HF measurements or accurately measuring the amplitude of signals. But the average hobbyist doesn't need that either. For most measurement jobs on audio amplifiers, experiments with Arduinos and similar hobby activities, the 1014D can undoubtedly become your indispensable and reliable instrument. The controls are simple and intuitive to operate, the oscillograms are clear. A plus point is definitely the possibility of powering the device from a 5 V power pack. A handy do-it-yourselfer could even install a battery, 5 V stabiliser and charging electronics in the largely empty space in the housing. As far as we are concerned, the 1014D can be unreservedly recommended to hobbyists and schools and for performing most of the common repairs on electronics devices.
FNIRSI-1014D 7 hüvelykes TFT LCD kijelző 2 az 1-ben Kétcsatornás bemenet Tárolás Oszcilloszkóp Digitális jelgenerátor
US$137.99 US$280.00
2
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jeever 22/01/2025
In terms of measurement accuracy, there is nothing to complain about this multimeter. In our tests of other cheap multimeters, there is always a measurement range we are not so satisfied with. That is not the case with this 189C. You can be confident that any measurements you make with this meter will produce a result that is more than accurate enough for the average hobbyist. The input resistance of 10 MΩ is excellent and so is the burden voltage of only 100 mV at 5 A. It is worth noting that the 189C also measures small capacitors satisfactorily, which is not the case with all cheap multimeters. About the uniqueness of this meter, its operation with the ‘Smart Rotary Knob’ praised by the manufacturer, we dare not judge. If you are used to multimeters with rotary knobs, switching to operating a meter with such a large, thumb-operated ring will take some getting used to. Whether you choose to do so is a matter of personal preference. But after some fiddling with the device, adjusting with the dial is very intuitive and easy. This is undoubtedly also due to the fact that after a while you know where the various measurement quantities and ranges are located on the circle, so you no longer have to search.
WinAPEX 189E Automatikus tartományú intelligens forgó multiméter Magas pontosságú 5999 számolás DC/AC Feszültség Áram Ellenállás Kapacitás Frekvencia Hőmérséklet Túlfeszültség-védelem
US$25.99
2
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jeever 27/06/2024
The GDE1030 lives up to its specifications and is a wonderful function generator with an excellent price/performance ratio. I have never found the combination of options listed below on a function generator in this price range: - Reconstruction of signals from up to 8,192 words of 14 bit. - Sine voltage adjustable from 2 mVrms. - Sine voltage up to 30 MHz without measurable attenuation. - Distortion on sine less than 0.2 %. - Rise time square wave smaller than 20 ns. - Rise and fall times of pulses separately adjustable. - Power supply from any 5 Vdc source. I can unreservedly recommend this device to any electronics hobbyist who wants to buy a versatile signal source for not too much money. In fact, I only miss one thing, and that is fold-out legs on the front that would allow you to place the device on the table at a better reading angle.
OWON DGE1030 DGE1060 Arbitáris hullámforma generátor 1 csatorna 30Mhz 60Mhz sávszélesség 14Bit Digitális Hullámforma Generátor
US$119.99 US$129.99
2
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jeever 23/09/2021
The internal looks neat and tidy. On the left you see the mains filter and next to it the rectifier of the mains voltage with two large smoothing capacitors. The electronics are still very traditionally built with axial components on a single-sided PCB with wire bridges. You will search without success for SMD components. Notice that isolation slots are milled into the PCB in many places. The heavier components are fixed with sealant. All in all, this power supply makes a reliable impression. We could not resist performing a few tests on this power supply. Our specimen produced a voltage of 65.263 V without load. Loaded with a current of 5.5 A, the voltage drops to 65.134 V. The voltage drop is thus 129 mV. This corresponds to an output stability of 0.20 %. The figure below compares the hum and noise at no-load (left) and full-load (right). The peak-to-peak value of the noise and ripple at full load is therefore 250 mV.
LED kapcsolóüzemű tápegység RD6006/RD6006-W S-400W-48V/DC12V/24V/36V/60V 8.3A-33.3A Támogatás a transzformátor világításának monitorozásához
US$35.99 US$51.83
15
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jeever 14/12/2024
There is little to criticise about this power supply. The measured performance matches the manufacturer's stated specifications nicely. We think the I8305 is an excellent power supply for the electronics hobbyist. Admittedly, we are not charmed by the way this power supply has to be set up. We prefer the old-fashioned rotary knobs rather than fiddling with small cursor keys. We also find the display far too busy. But this is obviously a very personal opinion and probably has a lot to do with our age and the way we were introduced to electronics 50 years ago. However, it is clear that the I8305 is not very different from the dozens of almost identical lab power supplies marketed by just as many Chinese manufacturers. Another fact to take into account is that there are cheaper power supplies on sale that can also deliver 30 V at 5 A, such as one from Nice-Power that costs only about € 40.00 and can be controlled with four simple rotary knobs. Admittedly, such models do not have adjustable 'OVP’ and 'OCP’ functions and presets, but the question is whether you will miss that very much.
Állítható tápegység BSIDE I8305/I83010/I84020 akár 300W teljesítménnyel, precíz vezérléssel, hatékony lég-hűtő rendszerrel és könnyű, kompakt kialakítással, sokoldalú elektronikai felhasználásra.
US$84.99 US$99.99
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jeever 26/08/2024
This is a lovely nostalgic kit that wouldn't look out of place in an ‘elektor’ from the 1980s. However, it is an ideal project to teach people how to solder and introduce them to digital electronics. The proper functioning of such a clock obviously hinges on the accuracy of the one-second clock pulse. We measured the pulse period with our frequency/period meter PM6669 from Fluke. Over a period of one day, the pulse duration varied between the two values below: - 0.999,762,6 second - 1.000,047,2 seconds The positive and negative deviations are probably caused by variations in room temperature. That, over one day, there is both positive and negative deviation from the exact value of 1,000,000.0 seconds is favourable. The lagging of the clock at 0.999,762,6 seconds is then partially offset by the leading at 1.000,047,2 seconds.
6 számjegyes DIY óra készlet, automatikus időkijelzés, forrasztási gyakorlati készlet diákoknak és DIY-soknak DC4.5V-5.5V
US$10.34 US$15.00
1
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jeever 07/10/2022
A major improvement is that the column on which the microscope is mounted can tilt backwards, so that much more space is available for soldering a PCB on the base. Tilting also helps against reflections in the image and it is much easier to decipher the lasered texts on chips at a certain angle. The LED lighting works great when it comes to getting a sharp and clear image of a detail of a part or a solder weld on a PCB. However, the color fidelity is worthless with this cold white lighting. If you want to take a nice picture of a small PCB, it is best to switch off the LEDs and use the natural ambient light. The microscope then provides much nicer and more color-true images. It often happens that we sell a tested product for half the price to one of our readers. That won't happen with this G1200(D) microscope! We keep it as a very worthy replacement for our old G600. After all, we are very satisfied with the quality and sturdiness of the G1200(D). The only downside that we can think of is the mechanical instability already described when you press one of the buttons, which causes the image to vibrate. A second later, however, the device gives a stable image again, you have very little trouble with it in practice.
MUSTOOL G1200D Digitális mikroszkóp 12MP 7 hüvelykes Nagy színes kijelző Nagy alapzatú LCD kijelző 1-1200X folyamatos fény mellett
US$86.99 US$99.99
5
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jeever 23/09/2021
Bought for a test as an example of a cheap Chinese 5½ digit multimeter. Ordered at Banggood on 7 June, received on 10 June! From the tracking code CQ616086601DE you can see that the 'country of origin' is supposedly Germany. No problems with import and VAT. Of course I quickly performed some preliminary tests which I want to share with you. I compared it with my Fluke 8842A. That one doesn't have a RMS board built in, so I can only compare Vdc, Idc and Ω. Below are the results of those quick tests, which show that this meter compares very well with the Fluke 8842A in terms of accuracy.
ET3255 Digitális 5 1/2 3.5 hüvelykes TFT LCD USB Multiméter Mérés
US$435.42 US$452.99
3
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jeever 14/09/2022
The electronics of the GY20451 The version of the GY20451 supplied to us contains only ten electronic parts. Thus, the scheme is quickly reconstructed and worked out in the illustration below. The 12 V supply voltage is converted into 5 Vdc in U1, an AMS1117, to power the microcontroller. Both the input and output of this stabilizer are decoupled with capacitors C5, C1 and C2. LED1 is connected to the 5 V output via the series resistor R1. An STC15W104 is used as microcontroller. It has a built-in clock generator, so no external parts are necessary in this scheme. Two square waves with a frequency of 40 kHz appear at the outputs P3.2 and P3.3. These two signals drive the two inputs of U3, a TCA4427. That is a double 'High-speed Power MOSFET Driver'. The outputs are connected by means of two MOSFETs either to ground or to the 12 V power supply. These two outputs directly feed the two piezoceramic resonators TX1 and TX2.
Ultrahang felfüggesztő elektronikus DIY gyártó részecskék hullámforrasztó képzési DIY készlet Tudományos kísérletek
US$16.09 US$13.99
13
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jeever 27/08/2024
Testing this device yielded the pleasant surprise that this TPS305 is a very good performing power supply for the money you have to pay for it. We can think of very few criticisms. Obviously, professional electronics engineers will turn their noses up at a power supply that delivers an rms ripple of around 30 mV at full load. But don't forget that that ripple drops to 6.5 mV if you reduce the current from full load (5.0 A) to 4.0 A. We think that, for a power supply costing less than fifty euros, is an excellent value. Also, the fact that in all our tests no overshoots, spikes or oscillations of any kind occurred on the output voltage argues in favour of the designers of this power supply. We have tested several power supplies in the same price range where this was anything but the case. For every hobbyist who plans to purchase a universal lab power supply, we think the TPS305 is an excellent choice
WANPTEK Laboratóriumi Padló Tápellátás 150W 300W 360W Laboratóriumi Switch Tápellátási Egység 30V 60V 120V 3A 5A 10A Állítható Digitális Feszültségstabilizátor EU Dugó
US$78.00 US$158.00
0
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jeever 14/08/2023
If you google the term 'breakdown voltage meter', you will find that although there is equipment that can measure this voltage, you have to pay hundreds to over a thousand euros for it. If you only occasionally feel the need to measure the breakdown voltage of a component, this small and inexpensive device offers a useful alternative to its much more expensive counterparts. That there is such a large ripple on the output voltage of 600 V may not be as it should be, but that probably has very little impact on measuring the breakdown voltage of a component.
110V-2600V IGBT tranzisztor feszültségképesség mérő Dióda MOS Triode Digitális voltmérő teszter Ütésálló feszültségmérő
US$27.99 US$45.99
3
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jeever 04/05/2024
With the BSIDE O1, the electronics hobbyist gets a very useful and reliable measuring instrument for measurements in almost all circuits he or she encounters. Although the oscilloscope only has basic functions, this is good enough for most measurements in the hobby range. What stands out is the measured bandwidth of 8 MHz and the excellent way a sine wave at that frequency still appears on the screen. The main criticism we have of this meter is the very poor contrast on the oscilloscope's screen. By choosing a lighter colour (yellow or light blue) in the software to display the oscillograms, this drawback can be overcome. A second inconvenience is that the ‘AUTO’ function sometimes takes a very long time to select the correct settings of sensitivity and time base. If you want to measure several signals in quick succession, this is rather frustrating. A pity is the fact that the manufacturer did not opt for a BNC input for the oscilloscope. That would obviously increase the price somewhat, but would allow the use of a standard oscilloscope measuring probe. The multimeter does what it is supposed to do: measure voltages, currents, resistors and capacitors fairly reliably. However, an additional current range of 100 mA would have been welcome!
BSIDE O1 3 az 1-ben Smart Oszcilloszkóp Grafikus Multiméter Funkció Oszcilloszkóp Multiméter Elektromos Toll 2.8" TFT Színes Kijelző 2000mAh Lítium Akkumulátor Magas pontosság Kényelmes Hordozható Eszköz
US$43.99 US$78.00
1
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jeever 16/04/2022
The is a very nice kit for teens interested in technology. It is easy to assemble, even without much electronics experience. It works guaranteed! All you need to make sure is that the LDRs and the LEDs are properly aligned. We made a course by sticking black insulating tape on a white table top. It is nice to see how the simple electronics are able to make the car follow this course flawlessly.
Követő járőr vonalintelligencia-robotautó DIY készlet redukciós motorral
US$10.34 US$12.46
1
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jeever 10/04/2022
The sensitivity is excellent. Even with a distance of 3 to 4 mm between your finger and the sensor side of the PCB, the module reacts by switching the output. We have attached a module to various sheet materials and investigated how this affects the sensitivity. Sheets of various types of plastic did not cause any problems. Even with a sheet 3 mm thick, the module reacts without problems when you touch it on the place where the module is located on the other side. This opens up interesting applications, such as making touchable front panels of measuring equipment! Glass is a different story, the module's output is already activated when the module is attached to a glass plate. The same applies to cardboard. We have not investigated how this works when an extra capacitor is soldered on the PCB to reduce sensitivity.
20db 2,5-5,5V TTP223 kapacitív érintőkapcsoló gombos önzáró modul
US$11.49 US$15.99
3
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jeever 03/09/2023
Too bad, very bad that this multimeter fails when measuring small capacitors. You can only reliably measure from 10 nF and up. All other measurement functions meet the specifications excellently. Working with the IR camera, with the logger and with the software is also all excellent, although we would have liked to see the accuracy of the IR sensor a bit better. Our advice to the manufacturer is to include in a future version of the firmware the 'REL' function present in almost every multimeter. That could solve the problems when measuring small capacitors and could also compensate for the parasitic resistance of the test leads when measuring small resistances. Our conclusion is that we find the ET12S an excellent little meter for everyday hobby electronics work. However, do not use it extensively in mains voltage circuits, because we find the input circuitry a bit too fragile to confidently recommend using it in 230 V systems.
TOOLTOP ET11S/ET12S 2 az 1-ben Hőkamera Digitális Multiméter 6000 Számláló Feszültség Áramerősség Ellenállás Kondenzátor Dioda Frekvencia Teszter PC Adatátvitel
US$72.00 US$199.00
5
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jeever 14/04/2018
Of course we were very curious about the accuracy of such a cheap temperature meter. Well, that is excellent, just look at the graph below. We compared the temperature measured with the TM-902C with the indication of a professional thermocouple meter from Lascar Electronics. We measured between -18 °C and +100 °C. We found the maximum deviation, as the specifications suggest, at temperatures below the freezing point of water. At a temperature of -18.0 °C the reading on the TM-902C was -22.8 °C. That is 0.8 °C more than the specifications indicate. At all other measuring points the observed deviation fell completely within the specifications. Two examples, where the laws of physics do not allow any misunderstanding about the real temperature: - Freezing point distilled water: -0.6 °C - Boiling point distilled water: +99.5 °C Very good!
TM-902C Digital LCD K Type Thermometer Temperature Meter with Probe
US$8.54
1
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jeever 10/05/2018
We are extremely satisfied with this microscope and we can recommend it if you are looking for such a tool. It is an ideal tool to check the soldering of SMD-components on your PCBs and to get the codes on such parts clearly visible. The only thing we miss is the possibility to offer the images directly to a PC via the USB port. If you want to do something with the photos, for example publishing on your blog, you have to remove the card from the microscope and connect it to the USB port of your PC via a card reader.
G600 Digital 1-600X 3,6 MP 4,3 hüvelykes HD LCD kijelzős mikroszkóp folyamatos nagyító frissítési verzió
US$64.67 US$67.99
9
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jeever 10/08/2018
The five delivered transistors have better specifications than the datasheet of the 2N3055 mentions. In the attached table, the current gains Ic/Ib and the base/emitter voltages Vbe of the five delivered transistors are summarized. According to the specifications, the current gain is 20 to 70. Decision: excellent quality!
5 darab 2N3055 NPN nagy teljesítményű erősítő és kapcsoló tranzisztor TO-3-as kivitelben
US$11.54 US$13.85
4
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