Single Crystal Filter (CB6542E)

High selectivity filters can be obtained by combining same frequency crystals in series as shown in the circuit.

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Precision Light Alarm with 741 and CMOS (CB25486E)
This circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit has a...
Power Supply from 0 to 12 V x 2 A (CB1252E)
This useful power supply can provide voltages from 0 to 12 V with currents up to 2 A, set in...
Bass and Treble Control (CB918E)
This circuit can be added to any audio amplifier design, consisting of a good tone control with an...