Based on an LM36000 OTA this circuit was found in the July 1988 issue of Radio Electronics magazine. It covers frequencies in the range of 45 Hz to 45 kHz.
Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the...
This circuit allows you to vary the duty cycle without changing the frequency. An interesting...
We found this circuit in the Philips integrated circuits manual of 1990. The basic component is...