Absolute Value Amplifier

Absolute Value Amplifier
The Absolute Value Amplifier circuit based operational amplifier chip 5535. This circuit can provide a positive output voltage for both polarity of input. For positive signals, it acts as a non-inverting amplifier for negative signals, as an inverting amplifier. (more…)

Voltage Controlled Amplifier

Voltage Controlled Amplifier
This Voltage Controlled Amplifier circuit is simply an op amp having an additional input at pin 5. A current ILsc is inserted into this input which controls the gain of the device linerly. Thus by inserting an audio signal(±10 mV) within pin 2 and 3 and with controlling the current on pin 5, the amount of the signal output (pin 6) is controlled. (more…)