Ujt-battery-charger


Posted on Aug 20, 2012

This circuit will not work unless the battery to be charged is connected with proper polarity. The battery voltage controls the charger and when the battery is fully charged, the charger will not supply current to the battery. The battery charging the current is obtained through the SCR when it is triggered into the conducting state by the UJT relaxation oscillator.


Ujt-battery-charger
Click here to download the full size of the above Circuit.

The oscillator is only activated when the battery voltage is low. V8281 of the UJT is derived from the voltage of the battery to be charged, and since Vp= Vn= V8281 ; the higher V828" the higher Vp. When Vp exceeds the breakdown voltage of the zener diode Zl, the UJT will cease to fire and the SCR will not conduct. This indicates that the battery has attained its desired charge as set by R2.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Flame-monitor
Sonar-transducer-switch
Firefly Lights Circuit
USB Digital Setting Circles
50 Watt Amplifier Circuit Using Transistor
555 timer mono stable one shot circuit
49MHz Toy RF Transmitter
Pal decoder
BINARY DECIMAL LED DISPLAY VERSIONS OF THE SIMPLE FREQUENCY COUNTER
T3SE type 3 SE
Keypad-Operated Switch No.2
Circuit diagram of an analog circuit PWM
Automatic lighting control telephone signals



Top