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Old 6th June 2003, 10:34 AM   #1
jarthel is offline jarthel  Australia
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Default Point to point or use a PCB

well traditionally, tubes circuits have used point to point.

Well it's ugly for me and hard to "debug" if there are problems in the circuit. Is it possible for me to use a PCB for th resistors/caps and other parts and connect the respected points to the tube pins using wires? Any negative effect on using a PCB?

Thanks for the replies.

Jayel
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Old 6th June 2003, 11:30 AM   #2
dhaen is offline dhaen  Europe
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Why not? Lots of commercial designs use PCB's. Not because they're easier, but because they're cheaper in quantity.

Debugging? A hell of a lot easier with P2P!

Downside? Longer cables with PCB's. Some say that's a problem.

Cheers,
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Old 6th June 2003, 11:42 AM   #3
jarthel is offline jarthel  Australia
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Quote:
Originally posted by dhaen

Debugging? A hell of a lot easier with P2P!
This is subjective and since I've built circuits only on PCBs/breadboards for the past 10 yrs, it's easier for me.


Quote:
Originally posted by dhaen

Downside? Longer cables with PCB's. Some say that's a problem.
any explanation on the downside?


thanks for the replies.

jayel
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Old 6th June 2003, 11:52 AM   #4
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Default To loooooong.....

Quote:
Originally posted by jarthel





any explanation on the downside?




As tubes are high impedance devices ...long cables are more prone to noise and hum pickup...
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Old 6th June 2003, 12:05 PM   #5
jarthel is offline jarthel  Australia
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what if I twisted pair (the other wire connected to ground) for every wire going into the tube socket pins?

I guess this would help. right?
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Old 6th June 2003, 12:26 PM   #6
dhaen is offline dhaen  Europe
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Default Not sure where this is going..

Quote:
Originally posted by dhaen:
Debugging? A hell of a lot easier with P2P!
[QUOTE]This is subjective and since I've built circuits only on PCBs/breadboards for the past 10 yrs, it's easier for me. [QUOTE]


Well, I have found considerable difficulty moving PCB traces

Seriously, it is possible to get a better job all round with P2P.
Oh, and in case you think I'm a luddite, and not "PCB aware", here's one of mine:
Here's one of mine (not valve though)

Cheers,

edit: typo corrected.
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Old 6th June 2003, 12:31 PM   #7
dhaen is offline dhaen  Europe
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Quote:
Originally posted by jarthel
what if I twisted pair (the other wire connected to ground) for every wire going into the tube socket pins?

I guess this would help. right?
Not at all; Possibly the worst thing you could do. High impedance circuitry is sensitive to even small capacitance.

Have a look at the pictures of kit built by others to get some idea of the best (established) techniques. You are unlikely to better them, until you gain considerable experience yourself. So you may as well follow them.

Cheers,
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Old 6th June 2003, 02:31 PM   #8
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Why not a P2P breadboard, and a PCB final? I'd keep ground P2P in the final since you're more apt to run into unforseen problems there than anywhere else.
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Old 6th June 2003, 03:59 PM   #9
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Quote:
Oh, and in case you think I'm a luddite, and not "PCB aware", here's one of mine:
John, I'll show you mine if you show me yours type behaviour is really not acceptable anymore these days

What on earth was that for?

Cheers,
Bas
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Old 6th June 2003, 04:31 PM   #10
dhaen is offline dhaen  Europe
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Quote:
Originally posted by Bas Horneman


John, I'll show you mine if you show me yours type behaviour is really not acceptable anymore these days

What on earth was that for?

Cheers,
Bas
I know it's Friday, but there's no point getting frisky


It's one of these......Blatent advert for someting no one on the forum would want

Cheers,
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