I want to build a high voltage power supply using a 1.5 AA battery?
Answer:
You should rig a ballast from a flouresent light. Did you know that they have an input of 120V but when it comes to sparking the gas and making the light the ballast produces a voltage of around 65,000 volts? Impressive but be careful, I don't think you'll get much time out of the 1.5 AA battery. You should definetly let me know how that turns out.
Try searching for the internet for plans for Switching Power Supplies. These power supplies use the transients response of a circuit to create a higher voltage
Generating a high voltage from relatively low voltage is quite a simple design principle. I have just finished a project of a similar nature recently.
The way I did it was to switch the DC, try using a FET or BJT and a 555 timer as the switching circuit. You now have a square wave AC signal (at the frequency the 555 is switching). Feed this into a step-up transformer and you have a high voltage AC signal. This can then be rectified and filtered if you need high voltage DC. You might need to filter the AC (lowpass filter) before you feed it into the transformer as the transformer might not like the square wave signal. This is due to the very high harmonic content of a square wave. Also play with the switching frequency, the higher the switching frequency, the smaller the size of the transformer that you'll need.
You will need a couple of AA batteries for this to work. The efficiency of this circuit should be quite good, but the power you will be able to deliver on secondary of transformer will be low. The current you supply on the secondary will be multiplied by the turns ratio of the transformer in order to calculate the amount of current needed to be supplied by the batteries (ignoring all losses). So I doubt the power supply will be of much use if powered by AA's.
Well it is very possible however with more that one 1.5V battery. If size is problem then i would suggest using a 9V square battery which is approximately as large as two AA batteries. If u need to produce a constant voltage i am not certain if it would work. However it will certainly work for pulsed operation. There are two types of circuits that you can construct: One would be a 9V to 220V ac converter or a 9V to HV circuit. Both these circuits are very popular. For the latter search for stun gun schematics on internet and find a simple design that uses only 1 mini audio transformer. You can then modify the circuit accordingly by removing the diodes and capacitors at the end of the circuit. These are voltage multipliers. For pulsed operation a simple 555 IC timer is suffiecient. A 9V to 220V AC circuit is slighly more complexed however designs can be found on the internet.
You can make a oscilater (change DC to high voltage AC)then change to dc
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