Treble Control (CB21293E)

This passive circuit was found in old American documentation. It can be added to any amplifier input since having losses of 20dB.

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Touch switch (CB9562E)
This sensitive touch key appears on this website from other sources. This version was taken from a...
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This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used...
LED strobe CIR11912S (CB19565E)
CMOS 4046 (PLL) is not very common. In this circuit it generates short pulses to excite a high...