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-   -   Printed circuit board designing? (http://www.diyaudio.com/forums/tubes-valves/117724-printed-circuit-board-designing.html)

Psychobiker 18th February 2008 10:10 PM

Printed circuit board designing?
 
Hey,

Using headers for all the valves, OP and IP trafo/choke connections, is it viable to put the rest on a circuit board? Just thinking it'd lessen the likelihood of stuff shorting out etc. I've Protel, and access to a milling machine :D

L

Robert McLean 18th February 2008 10:54 PM

Yes, absolutely. Many new amps are built that way.


For the valves, rather than use a header connected by a cable to the valve socket on the chassis, ( which is what I think you are describing ), you can use a pcb type tube socket instead. Or what I have done is use a regular old chassis type tube socket on the pcb with short jumper wires connected to points on the board.

Psychobiker 18th February 2008 11:25 PM

I was thing that, but there's a problem with some of the capacitors and clearances to the top of the chassis :(!!

L

Jeb-D. 19th February 2008 12:35 AM

If your trying to do PCB but panel mounting the tubes. Design it so that the sockets are mounted on the opposite side of the PCB from the components.

Psychobiker 19th February 2008 10:25 AM

Yup - I've personally chosen a PCB WAY bigger than I need, so that'll allow me to have a bank of connectors at one end (power), another at the other (valves), and keep all the components over by the power end, and keep the tracks well away from each other - ie. all the components are about 2x2", board is 9x12"....

Jeb-D. 19th February 2008 04:30 PM

Since you said component clearance was not enough with chassis top. It was suggested to mount the components on the opposite side of the board. Meaning mount the components on the bottom of the PCB and mount the sockets on the top. Clearence issue will be solved.

See how the sockets are mounted on the opposite side
http://diyaudioprojects.com/Tubes/K-12M/K-12Mboard.jpg

It allows you to panel mount the tubes when using a PCB.
http://diyaudioprojects.com/Tubes/K-12M/K-12Mfront.jpg

Psychobiker 20th February 2008 01:08 AM

All well and good, but our machine don't do that :p

Iain McNeill 20th February 2008 04:59 AM

Is the problem that you have to mirror the connections to the tube sockets?

Psychobiker 20th February 2008 10:41 AM

On second thought, that actually shouldn't be a problem

Psychobiker 23rd March 2008 12:14 AM

Jeb - is your heater wiring onboard?!

I've kept my HT and signal onboard (DC doesn't interfere with signal :p) and kept heaters offboard so they can be overkill-style treated for interfering with signal with twisting and braiding etc.

L


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