We found this circuit in a 1963 Radio Electronics. It can be used for remote control. The frequency depends on the coil and the power is supplied by a single battery.
This circuit is from a 1980 publication. In it we have a half-wave power control in which the SCR...
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...
This sound intensity meter was found in a 90s Elektor. The circuit uses an integrated device from...