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T O P I C    R E V I E W
namzer0 Posted - Nov 16 2009 : 06:37:57 AM

This is the site:
http://freecircuitdiagram.com/2008/12/18/transformerless-voltage-booster-circuit-a-dc-dc-step-up-switching-regulator-transistors

Do you think it could operate at 3V and output 9V-14V?(dual AA)

I wish to make a transformerless supply for an FM transmitter as much as possible, without using a 9V battery. but still have a long range of transmission... or in powering a headphone amplifier... not to mention, ripple noise from the inverter...

A ferrite xformer won't fit on my chosen case(too tall), that's why I chose it.

Thanks!
*too many questions...
3   L A T E S T    R E P L I E S    (Newest First)
audioguru Posted - Nov 17 2009 : 11:23:43 AM
An air-core inductor is used at VHF radio frequencies. It will be big and will have much too much resistance when used in a power supply.
namzer0 Posted - Nov 16 2009 : 9:31:24 PM
quote:
Originally posted by audioguru

The inductor might be the same size as a ferrite transformer.


Its air core, I can make it long so that it will be small...

you can't bend a ferrite core horizontally...
audioguru Posted - Nov 16 2009 : 10:26:04 AM
The circuit will probably work from 3V but will stop before the two AA cells drop to 2V.
Stepping up the voltage also steps up the current from the battery so it will not last long.

The inductor might be the same size as a ferrite transformer.

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