CGS Pulse Divider transistor question

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Leisure Cove
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CGS Pulse Divider transistor question

Post by Leisure Cove » Sun Feb 28, 2010 12:42 pm

I am populating a CGS Pulse Divider board and have a question:

Two of the transistors in the circuit are BC557, and the remaining transistors are BC547. There is no indication on the silkscreen side as to which transistors go where (as there is for the resistors, caps and ICs).

Can anyone point me in the right direction-- in particular, where should I insert the BC557s?

Thanks!

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Leisure Cove
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Post by Leisure Cove » Sun Feb 28, 2010 12:43 pm

(this is the Rev 1.2 board-- the most recent edition)

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fluxmonkey
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Post by fluxmonkey » Sun Feb 28, 2010 1:33 pm

the bc547s are NPN; their symbol has the arrow on the emitter pointing outward. the BC557s are PNP, their symbol has the arrow pointing in.

b
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Leisure Cove
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Post by Leisure Cove » Sun Feb 28, 2010 2:59 pm

Yes! Thanks!! :tu:

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zthee
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Post by zthee » Sun Feb 28, 2010 5:04 pm

PNP = Pointing iN Proudly
NPN = Not Point iN

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Tim Stinchcombe
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Post by Tim Stinchcombe » Sun Feb 28, 2010 5:58 pm

zthee wrote:PNP = Pointing iN Proudly
Very similar to the mnemonic I use: PNP = Point iN Plate - read it in a magazine years ago, and it has stayed with me ever since, and served me well!

Tim

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