One LED flasher by transistors-UJT-SCR-LM358

October 10, 2010, 5:46 am

≫ Next: 12V Battery charger using UJT

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These circuits are simple One LED flashers that use transistors as the main (first circuit), the transistor UJT (second circuit) and IC Op amps (the Third), Read more below. 1. As transistors is base. The capacitor C1.Resistors R1 frequency generator to Q1.Which acts like a switch.then used Q2 to be the current increase. Operation of [...]

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12V Battery charger using UJT

March 21, 2012, 9:49 am

≫ Next: Sawtooth wave generator circuit using UJT

≪ Previous: One LED flasher by transistors-UJT-SCR-LM358

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      This is an automatic 12V battery charger circuit, they uses the power SCR and UJT are main parts. And they will not work except the battery 12V to be charged with right polarity, so prevent errors as well. The battery voltage controls the charger and when the battery is fully charged, the charger will not [...]

Sawtooth wave generator circuit using UJT

September 11, 2013, 7:19 am

≪ Previous: 12V Battery charger using UJT

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In the Figure 1 circuit used Q1 is UJT to connects with VR1(potentiometer), VR2 and C1. They acts as a sawtooth wave generator circuit, by C1 to charge and discharge. Then, current from the 5V power supply through VR1 and R2. This current and voltage that increase and reduce, cause Q1 generate signal. Which have [...]