The ultimate output voltage with a supply voltage of 9 volts is about 300 Not a really ideal "inverter" circuit but a cheap-dirty one that can be made Reliable circuit unless the supply voltage is near or under 7 volts. This circuit shouldīe used as a cheap-and-dirty experimenter's circuit rather than a highly However, the LM386 seems to get rather hot at 12 volts. However, this circuit seems to workĪt up to 12 volts without anything burning out, or at least not too quickly. A 200 uFĬapacitor would be charged to 250 volts in approximately 16 seconds.Īt voltages near and above 9 volts, the rated limits of some of theĬomponents in this circuit are pushed. At 9 volts, thisĬircuit charges up capacitors at an average wattage of. Unimpressive with supply voltages under 8-9 volts or so. This circuit works from 4 to 12 volts DC. How to Use This Circuit and What to Expect The peak voltage of the AC delivered by the transformer. The DC output voltage is (not quite due to diode losses) nine times The nine diodes and nine capacitors form a voltage multiplying rectifierĬircuit. The transformer steps the output AC of the 386 by a factor of about 10. The oscillation from building up to the point that the LM386 clips, thisĬircuit would be a sinewave oscillator. If an automatic gain/level control circuit was added to keep 3.5 kilohertz and serves as the positive feedback route for The R1-R2-C1-C2 network has minimum loss and no phase The LM386 audio amplifier, R1 and R2, and C1 and C2 are used to make a crude However, the LM386 usually does not oscillate if these are omitted.īrief Description of this Circuit and How it Works In documentation for the LM386 in order to avoid ultrasonic oscillation. R3 is a 10K resistor that I recommend, even though none at all usually works. 2 to 2.2 uF rated at least 35 volts.įor best results, C should be at least. The eight capacitors labeled C should be. Negative terminal goes to the transformer. The positive terminal goes to Pin 5 of the LM386, the (One grounded, one feeds theĬout is at least 100 uF. (One grounded, one fed from Cout.) The blueĪnd green leads feed the voltage multiplier. T1 is a Radio Shack audio transformer, 273-1380. The LM386 is an audio amplifier IC, Radio Shack Catalog # 276-1731. This circuit sometimes works better with these, but ![]() 1 uF ceramic cap in parallel with an electrolyticĬap of at least 10 uF. Pin 6 gets B+ and also a capacitor (not shown) to Pin 4. This is a cheap-and-dirty experimenter's circuit. You don't need to build or wind any coils or transformers. This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack
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