MTC-IGFO Mastering Transfer Console Input Gain Filter Output Construction Information

Construction information for DIY projects, including the MS Mid Side Matrix, Elliptic Equalizer, Mastering Console, Phono Transfer System, Insert Switcher and the Dual Class-A Amplifier. You can post your baby pictures here.
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mediatechnology
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Re: MTC-IGFO Transfer Console Input Gain Filter Output Construction Information

Post by mediatechnology » Thu May 31, 2018 9:54 am

I do think the Goldpoints are neater as well.

Ben -

Since you're using 24V relays and have a +/-15 supply all you have to do is connect the relay common to -15V and the unregulated relay supply to +15.
The differential is 30V and the relay regulator only has to drop 6V.
It shouldn't be a thermal issue given the heatsink size.
Do note that the relay and control switch common will be at -15V and the relay regulated supply, when measured to ground, will appear to be +9V. (-15V +24V = +9V.)

If you wanted to leave yourself some room to grow use a +/-15V supply for the audio and a separate 24V supply for the relays.
The on-board regulators won't be required.

For each board requiring +/-15V I would devise a power distribution block near the power supply output (or connector) and take the +/-15V and DC 0V return lines from each board back to it.
I certainly wouldn't daisy-chain it from one board to the next.
Make the audio DC lines and relay supply lines "home runs" to the distribution block.
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Gold
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Re: MTC-IGFO Transfer Console Input Gain Filter Output Construction Information

Post by Gold » Thu May 31, 2018 10:56 am

mediatechnology wrote:
Thu May 31, 2018 9:54 am
For each board requiring +/-15V I would devise a power distribution block near the power supply output (or connector) and take the +/-15V and DC 0V return lines from each board back to it.
I certainly wouldn't daisy-chain it from one board to the next.
Make the audio DC lines and relay supply lines "home runs" to the distribution block.
I like Phoenix UT 2.5 DIN rail blocks.You can see them in the pictures of stuff I've built.

https://www.mouser.com/ProductDetail/651-3044076

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mediatechnology
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Re: MTC-IGFO Transfer Console Input Gain Filter Output Construction Information

Post by mediatechnology » Thu May 31, 2018 11:03 am

Thanks Paul. Roger used to use those.

I've also used barrier strips with the links that jumper between sections for that as well.

BTW Surplus Sales of Nebraska is very cool. https://www.surplussales.com/Electrical ... rip-1.html
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Re: MTC-IGFO Transfer Console Input Gain Filter Output Construction Information

Post by Gold » Thu May 31, 2018 11:24 am

That model of block can take 12 ga - 26 ga wire. They can be used for all the different wiring I deal with. I use them for DC power distribution mostly but I have used them for AC power distribution in racks and also for audio signal distribution occasionally.

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Re: MTC-IGFO Transfer Console Input Gain Filter Output Construction Information

Post by benewell » Sun Jun 03, 2018 11:30 am

Gold wrote:
Thu May 31, 2018 9:18 am
Elma 04’s are very sensitive to overheating. If you end upbwith a noisy switch it’s damaged beyond repair. I’ve destroyed my share. It’s an expensive lesson. I think it’s worth the money to buy an unstuffed Goldpoimt if the potentiometer configuration works for the application.
Thanks for the heads up. As I am still awaiting parts, I will have to keep this in mind when assembling later and testing. Duly noted on the Goldpoints for future reference!
mediatechnology wrote:
Thu May 31, 2018 9:54 am
Since you're using 24V relays and have a +/-15 supply all you have to do is connect the relay common to -15V and the unregulated relay supply to +15.
The differential is 30V and the relay regulator only has to drop 6V.
It shouldn't be a thermal issue given the heatsink size.
Do note that the relay and control switch common will be at -15V and the relay regulated supply, when measured to ground, will appear to be +9V. (-15V +24V = +9V.)

If you wanted to leave yourself some room to grow use a +/-15V supply for the audio and a separate 24V supply for the relays.
The on-board regulators won't be required.

For each board requiring +/-15V I would devise a power distribution block near the power supply output (or connector) and take the +/-15V and DC 0V return lines from each board back to it.
I certainly wouldn't daisy-chain it from one board to the next.
Make the audio DC lines and relay supply lines "home runs" to the distribution block.
Excellent. Thank you so much for the thorough explanation, this is an immense help and makes much more sense now!

Gold wrote:
Thu May 31, 2018 10:56 am
mediatechnology wrote:
Thu May 31, 2018 9:54 am
For each board requiring +/-15V I would devise a power distribution block near the power supply output (or connector) and take the +/-15V and DC 0V return lines from each board back to it.
I certainly wouldn't daisy-chain it from one board to the next.
Make the audio DC lines and relay supply lines "home runs" to the distribution block.
I like Phoenix UT 2.5 DIN rail blocks.You can see them in the pictures of stuff I've built.

https://www.mouser.com/ProductDetail/651-3044076
Thank you for the recommendation! I'll be looking into using these and placing (yet) another order soon.

Best
Brian

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mediatechnology
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Re: MTC-IGFO Mastering Transfer Console Input Gain Filter Output Construction Information

Post by mediatechnology » Sat Dec 29, 2018 4:59 pm

Update December 29, 2018: MTC-IGFO Assembly and Test Instructions: https://www.ka-electronics.com/images/p ... 2918_1.pdf
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