Bass Control (CB21294E)

This circuit with losses of 20 dB at 350 Hz was found in older documentation, but it applies to modern preamp and amplifier circuits.

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100kHz Astable (CB5431E)
We find this circuit in an old documentation, but it can be implemented with modern equivalent...
Transient Eliminator (CB13914E)
This circuit eliminates transients that are 10% above the zener voltage. The transistor must be in...
Sequential Two-Tone Detector (CB12668E)
A solution for using more than 6 channels in a tone-modulated system that uses LM567 as decoders, is to...