Help making a 2 transistor circuit to do what a SPDT swich does

[gotoluc]

Hi everyone

I would like the help of the more knowledgeable in electronics to design or show me a design of a circuit that uses 2 transistors to do the same work as a SPDT switch does. I have the components to build but can't find a basic circuit that does this. I have some IRF840's and a signal generator that has +20v -20v pulse peak to peak that I can use as gate triggers. I also have a built working 555 if that can work to flip flop (back and forth) the 2 mosfet's since I think it only goes on off, so it may not work with that circuit.

All I will be doing with the circuit is charging a cap from a bridge then disconnecting from bridge and discharging the cap to a coil. I need isolation between bridge and coil.

Thank you for your help. This will help me to further study my spark effect in a solid state way.

Luc

[Groundloop]

Luc,

Look here: http://home.no/ufoufoufoufo/bedini/bicp.htm

The bottom part of the circuit can be driven from a 555. You can also use just one fet transistor instead of two.

Groundloop.

[gotoluc]

Luc,

Look here: http://home.no/ufoufoufoufo/bedini/bicp.htm

The bottom part of the circuit can be driven from a 555. You can also use just one fet transistor instead of two.

Groundloop.

Thanks for the relpy and link Groundloop   This looks more complicated than I thought .

Luc

[Groundloop]

Luc,

Not really complicated. Look at the switch itself and forget the microcontroller circuit. Then take away the extra fet transistors
and you get the attached switch. It will be controlled by a +5 volt for ON and 0 volt for off. This will charge the capacitor and
then discharge the cap into a load.

Groundloop.

[c0mster]

http://www.doctronics.co.uk/4016.htm