This bench circuit was found in Radio Electronics magazine from June 1958. The circuit does not have an external power supply. The circuit generates signals from 12 Hz to 180 kHz in 4 bands.
This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio...
This circuit is from American documentation from the 1980s. The circuit can make use of any common...
We found this circuit in a 1977 documentation. The integrated circuit used is 4001. The signals...