This circuit makes use of an unusual Analog Devices component today. The circuit is from a 90's documentation. The amplifier has 80 dB gain.
This circuit was obtained from an English magazine from 1979, but it can be easily assembled today...
This is the normal circuit of a relaxation oscillator using an unijunction transistor such as the...
This sophisticated NiCad battery charger was found in a 1990s Elektor. The components used are...