This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an automatic transmission circuit for telegraphy. The circuit is TTL.
We found this circuit in a 1978 publication. It provides a different combination for alarm sensors...
This preamplifier for magnetic cartridges was found in the February 1990 issue of Radio...
This circuit has its frequency controlled by a 1MHz crystal. The circuit can be powered by...