This simple, unregulated power supply with an approximate 6 V output voltage can supply currents up to about 500 mA depending on the transformer. The diodes can be 1N4002.
This oscillator can generate signals from 100 kHz to more than 50 MHz depending on the crystal used...
Found in a 1980s American documentation, this circuit appears with variations elsewhere in this...
This circuit was obtained in a 1969 documentation. The circuit modulates both the emitter current and...