This circuit was found in a Radio Electronics from February 1966. The circuit operates with a common battery and the frequency is given by the resonant LC circuit.
This well-known circuit version of the siren was obtained in a Colectro Handbook from the 70s. The...
This 2mA source was found in a 1968’s Philips documentation. The transistor may be the BC549. |...
This sensitive medium wave (MW) radio pick up the local station without the need of an external...