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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Cascading the 4510 (CB181E)
Figure bellow shows how the 4510 can be cascaded for counts higher than 10. The circuit shows the...
Field strength meter (CB7564E)
This circuit that appears in similar versions on this site was found in a Popular Electronics from the...
Second-Order Low Pass Filter (CB25814E)
This 10 kHz filter is based on a 741 operational amplifier. The circuit is from Electronics Now...