Posted on Dec 14, 2012

The IC8211 provides the voltage reference and regulator amplifier, while Ql is the series pass transistor. Rl defines the output current of the IC8211, while Cl and C2 provide loop stability and also act to suppress feedthrough of input transients to the output supply. R2 and R3 determine the output voltage. In addition, the values of R2 and R3 are chosen to provide a small amount of standing current in Ql, which gives additional stability margin to the circuit.

Click here to download the full size of the above Circuit.

Where accurate setting of the output voltage is required, either R2 or R3 can be made adjustable. If R2 is made adjustable, the output voltage will vary linearly with the shaft angle; however, if the potentiometer wiper was to open the circuit, the output voltage would rise. In general, therefore, it is better to make R3 adjustable, since this gives fail-safe operation.

Leave Comment

characters left:

New Circuits



Popular Circuits

Digital oscillator
DIY Welder Control Board
build lithium ion battery
diy ambient orb with arduino update <77> comment page 3
amplifier electronic circuits audio amp schematics 170w lm4651 lm4652
darklight sensor using transistor
IrDA Interface
Pic Circuits
switching between parts circuit pulse input
MIDI Drum Machine Schematic Main CPU Section
Lighting inverter circuit principle 6 ~ 8W fluorescent