ODS 102 with 2x KT88s and built-in Dumbleator

[martin manning]

So, I'm just looking at the FET circuit and the Relay power supply.
If I use the Triad F-216X 12VAC supply, it looks like I use a FWB rectifier. I need a TO220 Regulator? Any recommendations? It just needs to regulate that 12VDC?

LM7812 regulator as shown on the D schematics will be fine. Looking at your FET relay connections, I see you are leaving the FET input and output floating. Better to ground the input in normal mode as shown in the eyelet board .pdf.

[bcmatt]

LM7812 regulator as shown on the D schematics will be fine. Looking at your FET relay connections, I see you are leaving the FET input and output floating. Better to ground the input in normal mode as shown in the eyelet board .pdf.

OK, thanks Martin. I think that was a combination of a late night and a lot of copy/pasting.
Does this make more sense now?

May 14.jpg

[martin manning]

Looks good now.

[didit]

Hello Matt --

I need a TO220 Regulator? Any recommendations? It just needs to regulate that 12VDC?

RECOM makes a series of LM78xx replacement devices using switch-mode DC-DC regulation that I have found worth the trouble. Here is a data sheet for 1A "TO220" devices: R-78C-1_0.

There is no need to provide heatsink as even with higher input voltages are better than 90%. Concerns around SMPS noise are sensible to raise, however RECOM has broad experience supplying industrial and medical applications that have regulatory demands for clean operation and my experience to-date has been that they are quite quiet. I see other companies including TI also offering similar product but have no first-hand experience to share.

FWIW.

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