Showing posts with label VOLTAGE. Show all posts
Showing posts with label VOLTAGE. Show all posts
Sunday, August 7, 2011
12VDC to 220VAC INVERTER CIRCUIT USING IC 555 SCHEMATIC DIAGRAM
12VDC to 220VAC INVERTER CIRCUIT USING IC 555 SCHEMATIC DIAGRAM
The 555 feeds its output (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament transformer with the necessary step-up turns ratio. Capacitor C4 and coil L1 filter the input to T1, assuring that it is effectively a sine wave. Adjust the value of T1 to your voltage. The output ( in watts) is up to you by selecting different components.
Input voltage is anywhere from +5V to +15Volt DC, adjust the 2700uF cap's working voltage accordingly. Replacement types for Q1 are: TIP41B, TIP41C, NTE196, ECG196, etc. Replacement types for Q2 are: TIP42B, TIP42C, NTE197, ECG197, etc.
Wednesday, July 6, 2011
Battery Charger Control Circuit
Battery charger control circuit is very useful now-a-days. You need not follow on battery charging or disconnect from ac power for avoiding over charge. This circuit is used to charge battery when the battery voltage drops below the minimum voltage that you want to connect it to a charger. When the battery voltage reaches the maximum voltage you want the charger to be connected.
Suppose that the application requires an inverting voltage level detector with hysteresis. That is V0 must go low when Ei goes above Vut and V0 must go high when Ei drops below Vlt. For this application, do not change the circuit or design procedure for the non-inverting voltage level detectors, simply add an inverting amplifier, or inverting comparator, to the output Vo.
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