Current Booster


Posted on Aug 10, 2012

Volt regulators such as the LM708, and LM317 series (and others) sometimes need to provide a little bit more current then they actually can handle. If that is the case, this little circuit can help out. A power transistor such as the 2N3772 or similar can be used (See the project on the 3-part variable power supply). The power transistor is used to boost the extra needed current above the maximum allowable current provided via the regulator. Current up to 1500mA(1.5amp) will flow through the regulator, anything above that makes the regulator conduct and adding the extra needed current to the output load.


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

It is no problem stacking power transistors for even more current. (see diagram). Both regulator and power transistor must be mounted on an adequate heatsink.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

LED display Digital Calendar AT89C2051
Human detector circuit
Pulse-dialing-telephone
1750M Transverter Circuit
Circuit schematicof 1.25G optical transceivers SSFF315l
Zipper Sensor
Compact Switching Step-Down Converter By MAX639
FM remote Encoder/Decoder
PIC16F688 Digital Voltmeter
usb switch schematic circuit
led bicycle lights
Remote tracking circuit schematics



Top