Trouble Wrapping my head around 3P4T wiring

[nate433]

I'm wanting to be able to quickly swap between 4 transistors when auditioning GE ones. I believe a 3P4T is what I'd want.



Going off of this diagram. Let's say A = Emitter, B = Base, and C = Collector. The 4 transistors would be wired up like this, correct?

E: 1
B: 5
C: 9

E: 2
B: 6
C: 9

E: 3
B: 7
C: 11

E: 4
B: 8
C: 12

 

[jcpst]

I didn’t take the time to think about it yet, but moonn has a breakout for a 4 way transistor switcher using a 2p4t, so that switch should work too

Why Not More? / 4-way transistor switcher

An ancient legend says in a long for gotten language: „More Transistors = More Good“ But what is the right transistor for your rangemaster (or...

moonnelectronics.bigcartel.com

 

[bean]

You only need to switch out the base and emitter in this case, so yeah a 2p4t will work fine here. That's a neat breakout board.

 

[nate433]

You only need to switch out the base and emitter in this case, so yeah a 2p4t will work fine here. That's a neat breakout board.

Interesting. How come you don't need to switch the collector?

 

[bean]

Interesting. How come you don't need to switch the collector?

Without the base and emitter attached no current conducts through the transistors not in use.

 

[darwin999]

Interesting. How come you don't need to switch the collector?

You connect all 4 collectors to the circuit. Only the transistor activated by the switch will carry current.