Re: TI-H: Circuit/component help
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Re: TI-H: Circuit/component help
speaking of transistors, anyone know of a NPN transistor that can handle
300+VDC at about 1Amp, 3Amp max
joe
Grant Stockly wrote:
> >I don't remember exactly how the flip-flops work, but they come in a lot
> >of packages (DIP14 for example) and can be set up such that the first time
> >a signal goes active the device will latch ON (or OFF, if you prefer) and
> >will ignore all additional signals until a reset happens. I haven't done
> >that for a while, though, so I don't remember exactly how to go about
> >doing it. A drawback to this is that you must have a nice clean 5 vdc
> >supply for the flip-flop, and then you'll need interface stuff for
> >whatever circuitry you want it to control.
>
> You wouldn't need too much interface stuff... Just a transistor depending
> on the load of the alarm or what ever he is going to connect to the trip
> thing.
>
> If you have the Radio Shack electronics book, there is a circut example
> that is exactly what Greg said. I think its in the IC section. Havn't
> read it in a long time.
>
> Grant
>
> >The SCR method should be pretty easy: SCR stands for Silicon Controlled
> >Rectifier. It's basically a diode, but it's got a gate in addition to the
> >anode and cathode. When a signal arrives at the gate, it allows current to
> >pass through the diode. Current will continue to flow, even after removal
> >of the activation signal, until the current is interrupted. So you set up
> >the circuit to give a pulse of whatever length to the gate of the SCR, and
> >put a normally closed momentary switch in series with the diode. When the
> >activation signal goes up, current flows. It continues to flow until the
> >SPST(n.o.) switch gets depressed.
> >
> >
> >--
> >Greg Hill
> >greg-hill@bigfoot.com
> >www.comports.com/link
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