Suggested by Mullard in a1969 documentation, this circuit generates the erasure signal for tape recorders of the time. Transistors can be modern equivalents like BD136 and BD136.
The trip circuit for this alarm is given in CB16765E. The circuit uses common components and acts...
This circuit is from an old American publication from 1970, but it can be assembled with a BF494...
This circuit found in 1969 Popular Electronics is used to power a gas laser. The circuit produces...