Re: impulse generator circuit design
- From: "Tom Bruhns" <k7itm@xxxxxxx>
- Date: 19 Nov 2006 13:21:52 -0800
On Nov 19, 12:53 pm, brandon.joseph.mo...@xxxxxxxxx wrote:
Howdy. I'm looking for an electronic circuit design that accomplishes
the following: using a DC voltage source first charge a capacitor to
a certain voltage level and then (automatically) discharge that
capacitor through another circuit, then start charging the capacitor
again so the process keeps repeating. So basically I need a circuit
that turns a constant DC voltage source into a series of current
impulses (because I want both the cyclical nature of the impulse and
also a higher current in the impulses than I would be able to get from
just the DC power supply I'm using, which will probably be a
not-too-large battery). One more thing, I would like this circuit to
run at a reasonable high frequency (maybe 50-200 Hz) so I'd prefer not
to have any mechanical components such as relays in the circuit since
it seems like they could wear out easily under those conditions.
So, any help I can get with this would be appreciated. I'm actually an
electrical engineer, but in control theory, so while I'll be able to
understand a circuit diagram I haven't done any real circuit work in
ages. Thanks.
What voltage? What capacitance? What load? (Is it resistive,
inductive, what? What sort of peak current are you looking for? How
long do you expect the output pulse to be? How much energy per pulse?)
Are you thinking to essentially just have the circuit connect the
capacitor to the load and let it discharge, then disconnect? How did
you have in mind charging the capacitor? (That is, would you just put
a resistor between the voltage source/battery and the capacitor, or do
you want to do something more complicated? -- A resistor will dissipate
half the energy provided by the voltage source, if the capacitor is
allowed to discharge to zero volts.) The simple form of what you
describe is just a relaxation oscillator, and there are some easy ways
to do it, but the easy ways usually have some limitation or other, and
their usefulness would depend on just what you're trying to accomplish.
Cheers,
Tom
.
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