This TTL time base for 60 Hz or 50 Hz can be used in instrumentation circuits or even with microcontrollers, serving as a precision shield. The circuit is based on 7400 NAND ports and two transistors.
If you have an old cassette player or bought one from a junk shop, you can set up a small table...
With this circuit we can use a high impedance source to excite a low impedance output. The input is...
We found this circuit in an old publication. The transformer has a 9 or 12 V secondary, and the...