norburybrook wrote: ↑Mon Apr 02, 2018 4:40 pm
Transformers and choke installed. Wired up the whole power section, voltage regulator etc etc . Fitted relay boards,need some help with the relays. Hopefully my pot and 5pin foot switch socket will arrive tomorrow and can crack on.DSC_1654.JPGDSC_1655.JPGDSC_1656.JPG
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Looks great!
What are the dimensions of the power supply board you created? I like how it houses all of the dropping caps on it instead of needing an extra one connected to a terminal strip like in the original layout.
Can you have a look at this and work out the new wiring for the of OD relay and the send return? The orange lines are what I think it should be for the send return.
I have only one master so it's a little confusing, along with no return and a weird relay.
70's hybrid relays.jpg
thanks
marcus
Marcus, the send return is OK.
You can do the relay wiring I'm sure. Do you know what pins are doing what on the relay?
Erwin,
I'm not sure how the calrad relay pins correspond to the newer omron relays and as I'm doing a send return that changes things too, so I'm a bit usure of what goes where.
@Matt,
The power board is Martin Mannings excellent work. i just ajusted the size to make it fir with my mounting holes. It's part of his ODS boards in the files section. I found some brown phenolic/paper board which i thought looked retro, so made them from that rather than the modern G10 stuff.
Well basically you can wire it like #124 but instead of tapping the od output from the ratio pot going to the relay(which isn't in #40) you go directly from the v2b output after the 1M resistor to the relay.
as far as the relay pin layout this might help: edit made a error in the text. Now it's ok
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thanks, that's a great relay explanation diagram for someone like me who is a visual learner that makes a lot of sense. I'm just going to take the dog for a walk then I'm going to put the pre amp board in and have a go at the relays.
I'm still waiting for the FET pot and my footswitch socket which won't get here until the end of the week but I can get everything else done and tested I think today.
I love it when a build is nearing completion....until I fire it up and it doesn't work...then spend another week tearing my hair out trouble shooting...that's usually the bit I learn the most from
norburybrook wrote: ↑Tue Apr 03, 2018 11:06 am
Thanks Martin.
I'm using a send and return does that change this?
Looking at the#124 for example the Level wiper goes to the send hence me presuming the pin 1 would go to the relay.
On the second gen there's no return(in) and that has the wiper going to the (relay) output.
. Do they all need to be shielded? I don't suppose it will do any harm. That Rg59 is horrible to work with.
Onwards.
M
The last drawing is ok. The send/return are after the master so that doesn't change a thing in relation to the relays. Shield to the grids V1a, V1b ,V2a and V2b are recomended, from v2b to relay you can get without.
Last edited by erwin_ve on Tue Apr 03, 2018 11:27 am, edited 2 times in total.
Your first try was closer, just missing a jumper from "unused" to "clean out." I'd use shielded cable for any long grid lead. Do the send/Return like 124, from the Level wiper to the send, and from the return back to the PI input. The OD relay is just like 124 too.
erm...so depending on which way would have an effect on the LED's? i.e one way would have the LEDS's on when in clean which would be backward..something that happened on one of my builds in fact.
So I presume it should be on clean when not 'energised'
while I have your attention.
I will not be using the 4 ohm tap as it's going to be in a combo, how does that affect the negative feedback, should I choose a different value and attach to the 8 or 16 ohm tap I'll be using?
for someone like me who is a visual learner that makes a lot of sense. I'm just going to take the dog for a walk then I'm going to put the pre amp board in and have a go at the relays.