This symmetrical power supply uses two old filament transformers. The circuit was obtained in a documentation from the 80's and the diodes can be 1N4002.
This CMOS generator with the 4018 IC was found in a November 1976 Radio Electronics magazine. It...
This TTL circuit found in the September 1996 issue of Electronics Now magazine doubles the...
We found this oscillator in a publication from the 1960s. The frequency is around 600 Hz with the...