Tone dial encoder

Amplifier with tone controls and soft switching. Notes: The soft switching is enabled by a BD131 transistor configured as a switch in an emitter follower arrangement. The collector is connected to a permanent load. The described amplifier circuit incorporates tone...

A sidetone oscillator is a specialized audio oscillator that is activated and deactivated in conjunction with the transmitter. This oscillator is driven by RF signals and is powered by batteries. It employs a 555 integrated circuit (IC) timer configured...

This simple tone control can be used in many audio applications. It can be added to amplifiers, used as a standalone control module, or even built into new and exciting instruments. Its single integrated circuit (IC) construction makes it...

With a dual supply voltage, the external capacitor on pin 10 can be connected to ground to stop the oscillation of the 8038. The circuit employs a FET switch and a diode, which are combined with an input strobe...

A general-purpose preamplifier/mixer accepts up to four inputs, has a gain of 1600, and provides bass and treble controls that can be varied ± 10 dB at 100 Hz and 10 kHz respectively. More: IC1 and IC2 = LM301A. This...

Tone Control. Parts: Total Quantity of Parts: Substitutions C1, C3, C5, C7, C15, C16 - 6 pieces of 2.2µF Electrolytic Capacitors; C2, C6 - 2 pieces of 0.05µF Ceramic Capacitors. The tone control circuit is designed to adjust the frequency...