Band-Pass Filter (CB14921E)

This circuit was found in a Poptronics of the 90's. The components can be changed to the desired frequency. The power supply must be symmetrical.

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Delay with constant current charger (CB9495E)
Found in Motorola documentation from the 90's, this circuit charges the capacitor with a constant...
Mixer Preamplifier Using FET (CB244E)
This circuit has two high-impedance inputs. The gain is high and more inputs can be added. Use a...
4 W amplifier TDA2611 (CB15392E)
We found this circuit in the Philips Databook of 1990. The circuit is indicated for low-cost...