We found this circuit in a publication from the 1980s. Transistors can be replaced by current equivalents. The circuit is for 6 V and the capacitors determine the frequency of the oscillations.
The frequency of the blinking of this circuit is given by the capacitor that can have its value...
This low-current power supply was obtained in Japanese documentation from 1968. The currents are...
This simple audio booster came out in a Popular Electronics in the 90s. It serves as a booster for very...