Something that I never knew until now. I’ll have to investigate further. Texas Instruments’ Gordon Teal Demonstrated Silicon transistor’s superiority at high temperature in 1954 https://www.facebook.com/reel/4383015895310864/?mibextid=9drbnH&s=yWDuG2&fs=e
Archive for the ‘Transistors’ Category:
2026-04-13 Asianometry Tells About The Regency TR-1 Using A Matched Pair Of 2N185 Texas Instruments Germanium Transistors
Asianometry tells about the Regency TR-1 using a matched pair of 2N185 Texas Instruments germanium transistors. After 2:20 time
2025-10-06 Schematic Of On-Off Touch Switch, Latching
This circuit uses four BJTs – 3 NPN and 1 PNP high current to drive the load. It has two touch pads, one for On and one for Off. I don’t see any information about the power supply voltage or load current. Some maximum voltage and current should be given for the circuit as shown.
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2025-08-10 Night Light Wastes Power Shunting Current From LEDs
This is the comment I left in Big Clive’s channel video. “I think this shunting current away from the LEDs is deceptive and fraudulent. They should be required to tell this in the instructions. In the US there are regulations governing vampire devices such as the AC adapters and their efficiency levels. Since they’re on
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2024-11-08 RF Amp Using BD139 Power Transistors
He has a strong Aussie accent, a bit hard to understand. It’s a 28 min. YouTube video. He says BD139s have a fT of 250 MHz, but the datasheet I have does not specify any fT because the D in BD139 means they are a low frequency device, not meant for VHFs or RFs in
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2024-10-08 Transistor History – Raytheon, CK722, etc.
Long article https://sites.google.com/site/transistorhistory/Home/us-semiconductor-manufacturers/raytheon-part-one-2 A comprehensive history of the Raytheon corporation. Also information about other companies.
2024-08-31 AM Transmitter, Low Power
This is an AM transmitter that this guy built. He says it’s rich in harmonics – it has no tuning nor low pass filtering and the stages are class C, no forward bias. It should have all the things used to minimize harmonics, like a low pass filter. Class C operation is used to maximize
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2024-08-21 Adjustable Power Supply Uses Sziklai Pair
This messy bunch of parts is a 0 to 9V adjustable power supply. The original power supply board connected the two transistors in the Darlington Configuration. The unregulated 12V input goes through a 187 ohm resistor to a 10V zener diode to give a stable reference voltage. This voltage is fed to a 2.5k linear
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2024-08-21 Video: Build An FM Microphone
This 2.5 min video uses a SS8050 transistor which is not very good for a 100 MHz oscillator. https://www.facebook.com/reel/347155875050146?mibextid=9drbnH&s=yWDuG2&fs=e
2024-04-20 RCWL-0516 Microwave Doppler Motion Sensor Module Schematic KO4BB
The modules use both the RCWL-9616 and the BISS-0001 but it seems the schematics are all labeled BISS-0001. The parts values are different. He gives some good information about them. They operate at 3.5 and 3.98 GHz – the ones I have were advertised at 5 GHz. Also he shows his own version that uses a
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