This shows the difference between the crocodile clips and the alligator clips, and other test clips made for decades by Mueller company.
Archive for the ‘Meters and Test Equipment’ Category:
2022-04-07 Audible Light Meter
This circuit could be used for blind to sense light. It’s a similar circuit to the police siren. The two transistors have a current gain of 200 X 200 or 40,000 so even a very tiny Q1 base current – microamps – causes a very large Q2 collector current. So a very small amount of
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2022-03-02 Solder Dispensing Pen
I use this for holding solder while I hold the PCB and iron with my hands. I use my teeth to hold this pen.
2022-02-27 Caps Wiki – Repairing Electronics
Caps Wiki – a place for you to share your repair notes. I like the idea. I’m wondering if I have the patience to spend the extra time. https://hackaday.com/2022/02/24/caps-wiki-place-for-you-to-share-your-repair-notes/
2021-11-12 5 Transistor ESR Meter – EEVBlog
This is a 5 transistor ESR meter for testing capacitors. https://eevblog.com/forum/projects/5-transistor-esr-meter-design/
2021-07-29 Heathkit IP-18 Power Supply Re-Cap
Last week I saw an old Heathkit IP-18 power supply on eBay for $50 OBO, free shipping. I don’t really need another PS, but I’m a Heathkit builder and a big fan. So I offered $30, thinking the seller would not take it. But a few hours later the message came that the seller had
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2020-11-02 Signal Tracer Or Audio Amp From An Old AM Radio
Its not hard to make a signal tracer from an old AM radio. You need 60 mm of red and black flexible twisted pair, a 0.22 uF, 100V capacitor, a small black alligator clip, a 50 mm length of shrink tubing that will fit over the following probe, and a thin 100 mm long piece
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2020-10-29 Freq Counter – Crystal Tester Mod For Low Frequencies
I got this frequency counter and crystal tester mainly for the frequency counter. Today I decided to test a few crystals, and was successful with ones above 10 MHz but not at 4 MHz. The two capacitors labeled C2 and C3 are the feedback to the crystal, and they were originally 22 pF. So I
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2020-05-19 Transistor Tester And Other Components
Here is a writeup from another radio enthusiast about his newly purchased Mega 328 uC based component tester. They come in handy for testing electrolytic capacitors especially for ESR – equivalent series resistance. The tester will also test silicon and germanium transistors, handy for making a judgment on how leaky it is. I have a
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2020-03-29 AM Osc + Modulation + Buffer
This is from Electronics Illustrated Projects 1968. It shows crystal sockets, but instead a RF coil may be used and its value will be about 220 microhenrys. And C1 and C2 will have to be changed to bring the frequency down to the AM band. The germanium transistors are no longer available so silicon transistors
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