Self switching Power Supply


Posted on Dec 2, 2012

One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its output voltage is variable. This is achieved by connecting a potentiometer between common terminal of regulator IC and ground. For every 100-ohm increment in the in-circuit value of the resistance of potentiometer VR1, the output voltage increases by 1 volt. Thus, the output varies from 3.7V to 8.7V (taking into account 1.3-volt drop across diodes D1 and D2).


Self switching Power Supply
Click here to download the full size of the above Circuit.

Another important feature of the supply is that it switches itself off when no load is connected across its output terminals. This is achieved with the help of transistors T1 and T2, diodes D1 and D2, and capacitor C2. When a load is connected at the outp




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Resistor change
led strip Using a N-Mosfet to switch a common cathode ledstrip
ultra miniature transmitter
12 vdc to 220 vac converter circuits
arduino masterpieces
Serial To Parallel Converter
emf meter project
LED torch using NSI45090JDT4G constant current regulator
Precision frequency counter
CD4013 circuit
BA328 stereo preamplifier circuit



Top