Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
This circuit was found in a Philips documentation from 1966. The circuit provides 1 mW with a...
The frequency of this oscillator depends on the crystal used. The transistors are general purpose. We...
Found in an EDN from the 90s, this circuit has a distortion of only 0.003%. Capacitors and double...