A short video on a quick test for PCBs
Archive for the ‘Electronic Components’ Category:
2024-12-15 Hot Arcs From Flyback Transformers Play “Take On Me” by Ah-hah
Hot Arcs From Flyback Transformers Play “Take On Me” by Ah-hah. The flybacks are driven by a power amp made for driving these flyback transformers. Looks like just a few turns of 18 AWG wire are wrapped around the bare ferrite cores. A highly effective plasma speaker, better sounding than a Tesla coil. https://www.facebook.com/franzolielectronics/videos/272985324667136/?mibextid=9drbnH&s=yWDuG2&fs=e
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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2024-10-20 Diodes And Diode Properties
https://www.facebook.com/reel/1105829214300191/?mibextid=9drbnH
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.
2024-09-20 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
2024-08-31 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
