Audio Tone Balance Circuits

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Low-pass filter
A Simple Metal Detector Circuit Using Beat Frequency Oscillator (BFO)
The method of temperature controlling system of producing one-chip computer calorstat is analyzed
A new stable RC pulse generator
transistor astable multivibrator
remote control mains switch
Diac Applications
Hi-fi AM detector
2N2222 NPN Small Signal General Purpose Amplifiers
Adjustable Power Supply with Charger Output
TDA4863AJ Basic Application Circuit a