This circuit is from a Radio Electronics from April 1964. The circuit uses power transistors of the time, which must be mounted on a good heat radiator. Modern equivalents can be used.
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...