Asianometry tells about the Regency TR-1 using a matched pair of 2N185 Texas Instruments germanium transistors. After 2:20 time
Archive for the ‘Meters and Test Equipment’ Category:
2026-02-11 Recommend Oscilloscope And Power Supply
It depends on your budget. Some others recommend used high end equipment. I have some older HP equipment. But I bought a new FNIRSI 100 mHz DSO – digital sampling oscilloscope. It’s much more portable than older scopes, it runs off a 5V charger and does so many more things than older scopes. You can
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2025-11-20 Designing A Super Simple Voltage Indicator Based On Battery Charge Indicator
I’ve considered how to turn a power on indicator LED into an output voltage indicator for an adjustable power supply. All the user would see is the indicator LED. This LED would be full brightness when the PS is on, except when it is indicating the voltage, which is when the LED will dim. The
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2025-09-13 Every School Should Have A “Fix-it Lab” Where Students Learn To Repair Their Clothes, Bikes And Electronics.
“”Every school should have a “fix-it lab” where students learn to repair their clothes, bikes and electronics. We should grow up knowing that not everything is disposable, that care and repair are part of living well on this planet.”” https://www.facebook.com/reel/1280502713546957/?mibextid=9drbnH&s=yWDuG2&fs=e
2025-08-26 MOSFET Tester Is Not So Good
The average hobbyist should not rely on this tester because of the deficiencies listed below. Instead he or she should buy a transistor tester that can analyze the device and tell what the pin out is and polarity, N-channel or P-channel. Also it can tell if the device is a MOSFET or a regular power
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2025-05-31 FNIRSI DSO-TC4 Screen problem
This guy has the same problem as I have: the screen is scrambled in some places – top and bottom.
2025-03-28 Measuring And Minimising Transistor Switching Loss – Double Pulse Testing
Here’s a 17 min. video describing the above in the title. It’s technical and somewhat complicated but calculates the power dissopated during switching. There are a lot of important details, such as the value of the gate resistor. I think I need to do a lot more studying about this topic.
2025-02-27 Egyptians Used Copper Tools To Cut Stone
This is how the Egyptians used copper tools to cut the stone blocks. https://www.facebook.com/reel/615624941183863/?mibextid=9drbnH&s=yWDuG2&fs=e
2024-09-20 Simple 1 Digit Counter, IR Beam Break
This short uses a CD4026, a 7 segment display, 9V battery, some resistors, an IR LED and a CdS photocell or phototransistor. Break the IR beam and the display advances to the next digit. https://www.facebook.com/reel/525596709839365?mibextid=9drbnH
2024-03-30 MX20T Link Switch Port Tester
A long time ago when we were going to Cat5 UTP, I had a lot of these MX20Ts left over. So I made up a 15 pin plug with the negative 9VDC on pin 6 and positive on pin 13, and soldered the wires to the battery contacts. I taped the battery to the back
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