Found in a 1967 Electronic Design, this circuit operates in a range of 0 to 1 V input with frequencies determined by C2. The components are from the period.
This circuit is from an April 2000 Poptronics. The magazine no longer exists, but the circuit can...
We found this circuit in the Radio Electronics Handbook magazine special edition of 1992. The...
The integrated circuit used in this project is uncommon today, but the configuration can be...