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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.
Έξυπνο κιτ ρολογιού DIY 6 ψηφίων, αυτόματη εμφάνιση ώρας, κιτ εξάσκησης κόλλησης για μαθητές και ερασιτέχνες DC4.5V-5.5V
US$10.34 US$15.00
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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.
Ψηφιακό μικροσκόπιο MUSTOOL G1200D 12MP 7 ίντσες Μεγάλη έγχρωμη οθόνη Μεγάλη βάση οθόνης LCD 1-1200X Συνεχής με φως
US$86.99 US$99.99
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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.
Ψηφιακό ET3255 5 1/2 Οθόνη TFT LCD USB Πολυμετρικό μέτρησης
US$435.42 US$452.99
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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.
Εργαστηριακή τροφοδοσία WANPTEK Lab μετασχηματιστή 300W EU Plug Μονάδα τροφοδοσίας μεταγωγής τροφοδοτεί ψηφιακή πηγή 30V 10A Σταθεροποιητής τάσης 60V 5A
US$78.00 US$158.00
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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.
Ηλεκτρονικό σετ κατασκευής υπερήχων ανάρτησης DIY, εκπαίδευση κυματικού κόλλησης DIY και πείραμα επιστήμης
US$16.09 US$13.99
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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
Εργαστηριακή τροφοδοσία WANPTEK Lab μετασχηματιστή 300W EU Plug Μονάδα τροφοδοσίας μεταγωγής τροφοδοτεί ψηφιακή πηγή 30V 10A Σταθεροποιητής τάσης 60V 5A
US$78.00 US$158.00
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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 Arbitrary Waveform Generator 1 Κανάλι 30Mhz 60Mhz Πλάτος Ζώνης 14 Bit Ψηφιακός Γεννήτρια Κύματος
US$119.99 US$129.99
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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.
Τροφοδοτικό εναλλασσόμενου ρεύματος LED RD6006/RD6006-W S-400W-48V/DC12V/24V/36V/60V 8.3A-33.3A Υποστήριξη παρακολούθησης μετασχηματιστή φωτισμού
US$35.99 US$51.83
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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.
Δοκιμαστής ικανότητας τάσης τρανζίστορ IGBT 110V-2600V με δίοδο MOS Triode Ψηφιακό βολόμετρο Εργαλείο δοκιμής Δοκιμαστής αντοχής τάσης
US$27.99 US$45.99
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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-σε-1 Δέλτα Έξυπνο Πολύμετρο Grafs Λειτουργία Οσκιλλοσκόπιο Πολύμετρο Ηλεκτρικό Πένα 2.8" TFT Έγχρωμη Οθόνη 2000mAh Μπαταρία Λιθίου Υψηλή ακρίβεια Βολικό Φορητό Εργαλείο
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.
Παρακολούθηση Ρομπότ Αυτοκινήτου DIY Kit με Μείωση Μηχανής
US$10.34 US$10.99
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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 Οθόνη TFT LCD 7 ιντσών 2 σε 1 Διπλή είσοδος καναλιών Αποθήκευση Οσκιλλοσκοπίου Γεννήτρια ψηφιακού σήματος
US$149.99 US$280.00
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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.
20pcs 2.5-5.5V TTP223 Χωρητικός διακόπτης αφής Κουμπί Self Lock Module
US$11.49 US$15.99
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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 2In1 Θερμική Κάμερα ψηφιακό πολύμετρο 6000 Μετρά Τάση Ρεύμα Αντίσταση Πυκνωτή Διόδιο Δοκιμασία Συχνότητα Μεταβίβαση Δεδομένων Υπολογιστή
US$72.00 US$199.00
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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.
Έκδοση συνεχούς αναβάθμισης μικροσκοπίου οθόνης LCD G600 Digital 1-600X 3,6MP 4,3 ιντσών HD
US$64.67 US$67.99
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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 τεμάχια Ισχυρού Ενισχυτή και Διακόπτη NPN 2N3055 TO-3
US$11.54 US$7.99
4
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jeever 17/08/2018
We were skeptical when we ordered this meter. After all, what quality can you expect for a price of less than five euros? As our test progressed, however, we became more and more enthusiastic about the Aneng Type 180. For measuring DC voltages, direct currents and resistances, you can not wish a better universal meter. And let this be just the things that you usually measure in practice! For measuring AC voltages, this meter is less suitable because of the rather large inaccuracy and the limited bandwidth.
ANENG Mini Digital Multimeter with Buzzer Overload Protection Pocket Voltage Ampere Ohm Meter
US$15.99 US$19.99
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jeever 09/10/2018
This wall transmitter contains, see the picture below, amazingly little electronics. What is immediately noticeable is that there is space on the PCB for three print switches, of which only the middle one is present. A handyman can therefore make a three-channel transmitter from this single-channel transmitter with some soldering work. The large transmitting antenna that fills approximately half of the print surface provides a wide range or 25 m. The only chip on the PCB is an eV1527 and when you look up the datasheet of this IC it appears that this chip is internally programmed on one out of a total of 1,048,576 address codes. After transmitting this 20-bit wide address code, the switch transmits four data bits.
SONOFF® Wireless Remote Transmitter 1 Channel Sticky RF TX Smart Module
US$7.99 US$9.99
22
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jeever 22/10/2018
The S-150-12 is an excellent 12 Vdc at 12.5 A power supply for a good price. The stability of the output voltage between zero load and 10 A load is excellent, with a variation of only 9 mV. Long-term stability, with a maximum deviation of only 14 mV, is also better than expected. Only the 100 Hz ripple at the output at a current of 10 A is more than specified by the manufacturer (125 mV), but is still very acceptable.
Μετατροπέας τροφοδοσίας διακόπτη AC 85-265V σε DC 12V 12.5A 150W για ταινία LED
US$30.02 US$31.99
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