Generic switching transistor?? - Electronic Circuits Projects Diagrams Free

things · 27th October 2007, 02:24 AM

hi all,
I need to build a timer circuit for a fog machine, and know all the other stuff, but one thing that has got me is that it needs a "generic switching transistor"?? All this transistor has to do is switch a relay, so it doesn't have to be rated for high current. Does anyone know what make numbers some of these are?
thanks!

ssylee · 27th October 2007, 02:28 AM

I think what it's meant by "generic switching transistor" would be a generic pnp or npn transistor like a 2N3906 + 2N3904 pair or 2N2907 + 2N2222 pair. Correct me if I'm wrong. You would have to do some calculations based on how much current you want and how fast you want them to switch.

blueroomelectronics · 27th October 2007, 02:28 AM

2N2222A is pretty generic (assuming NPN is required)

things · 27th October 2007, 02:31 AM

well it doesn't tell me whether NPN or not, but this is the circuit i am trying to build. Fast switching is not really a prob, since it is for a fog fogtimer01.gifmachine.

blueroomelectronics · 27th October 2007, 02:37 AM

It's NPN, a 2N2222A will work fine.

things · 27th October 2007, 02:38 AM

ok thanks alot guys!

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27th October 2007, 02:24 AM	(permalink)
things	Generic switching transistor?? hi all, I need to build a timer circuit for a fog machine, and know all the other stuff, but one thing that has got me is that it needs a "generic switching transistor"?? All this transistor has to do is switch a relay, so it doesn't have to be rated for high current. Does anyone know what make numbers some of these are? thanks! __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.

27th October 2007, 02:28 AM	(permalink)
ssylee	I think what it's meant by "generic switching transistor" would be a generic pnp or npn transistor like a 2N3906 + 2N3904 pair or 2N2907 + 2N2222 pair. Correct me if I'm wrong. You would have to do some calculations based on how much current you want and how fast you want them to switch.

27th October 2007, 02:28 AM	(permalink)
blueroomelectronics	2N2222A is pretty generic (assuming NPN is required) __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

27th October 2007, 02:31 AM	(permalink)
things	well it doesn't tell me whether NPN or not, but this is the circuit i am trying to build. Fast switching is not really a prob, since it is for a fog fogtimer01.gifmachine. __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.

27th October 2007, 02:37 AM	(permalink)
blueroomelectronics	It's NPN, a 2N2222A will work fine. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

27th October 2007, 02:38 AM	(permalink)
things	ok thanks alot guys! __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.