Using old germanium transistors like the CK722, this circuit has good gain. We found it in a publication from the 50s.
This circuit uses the 7493 to divide a TTL square signal by 8. The circuit must be powered from a...
This circuit uses a feedback integrator. We found it in Ferranti's transistor manual from 1974....
Found in a Popular Electronics from the 9s, this circuit has output for RS-232 interfaces and current...