This circuit was used in tape recorders to clear the tape of any previous recordings for a new recording. The circuit is from a Radio Electronics dated September 1982.
This circuit is from a Popular Electronics from the 80's. The components used are not common...
This circuit for 6 lamps was found in old American documentation. The supply is of high voltage...
The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be...