This synthesizer circuit was found in a Radio Electronics magazine from May 1983. The circuit uses common components and does not require a balanced power supply.
Found in Motorola documentation from the 90's, this circuit charges the capacitor with a constant...
This circuit has two high-impedance inputs. The gain is high and more inputs can be added. Use a...
We found this circuit in the Philips Databook of 1990. The circuit is indicated for low-cost...