This 6-transistor Japanese radio for the medium wave range was manufactured in the 1960s in Japan. The circuit is superheterodyne with a 6 V power supply.
This sonic, sound or vox switch uses common SCR and transistors can be BC548 or equivalent. The...
This circuit allows you to use a calculator as a timer by directly activating a sum key with...
This circuit is from the time when photos were revealed in darkrooms. We found it in a 1968...