Posts Tagged ‘power supply’:

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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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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