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Square wave generator

galveston

Mar 26, 2009
3
Joined
Mar 26, 2009
Messages
3
I am an electronics dummy who needs to build a square wave generator.
I have a schematic that I think I can build BUT there are 2 components that I can't identify, so can't buy.

One is a triangle symbol (LM741) that has pins (?) nubered 2,3,4,6,7. (no 1 or 5) This is part of a throttle array that feeds into pin 5 of (NE555).

The other is shown as a circle with 2 parallel lines, one shorter. The short line receives a pulse wave from a mosfet (TC4420CPA) pin #6. The long line shows a wire leading from each end. One goes to an electrode and the other to a ground. Near this circle I see (ifrs 10) or maybe that's (1frs 10) and beneath this (tr 3). There is a number 5 near the circle and the word mosfet.

The guys at the electronics supply house couldn't identify this item.

Any and all help greatly appreciated.
 

galveston

Mar 26, 2009
3
Joined
Mar 26, 2009
Messages
3
LM741 is an operational amplifier (op amp)
The other component is a mosfet transistor (tr5)
Sir-kit Electronics
Thanks.
I have 2 more questions. What is a mosfet driver TC4420CPA? Is that a transistor also?

I tried to find some of these components on line and have run into a wall. One place wants WAY more info than I have to even find a part #. Can you reccommend a site to order from? Most of the things I need are basic resistors and capacitors, dip switches & not gates.
 

galveston

Mar 26, 2009
3
Joined
Mar 26, 2009
Messages
3
Thanks for the replies.
I have been reading everything I can find on the subject, and now have some more questions.
I built an electrode (225 sq in. of .040 gap). In tap water and hooked to a 12V auto battery, it draws about 80A and will boil water in 3 seconds flat. Obviously that is too many amps, so I think I need to use a step-up transformer or maybe a flyback to boost the volts and reduce the amps to a workable level. Since the electrode in water acts as a capacitor, would it be possible to simply fire a step-up transformer with a schmitt trigger to get a high voltage pulsed current in the electrode?
 
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