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Old 15th November 2007, 04:59 AM   #8371
Pars is offline Pars  United States
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Default Muting relays?

Back around post 4711 or so (page 189), there were a couple pictures of a muting relay circuit (Rays?). Any particularl realys you guys find that work well? I'm putting a realy muting circuit into my Rotel RCD855 (along with a discrete I/V stage) and had planned on using an Omron G6A-234P-ST-US-DC12 http://oeiwcsnts1.omron.com/ocb_pdfc...D20G6A0305.pdf, but will switch to something else if this one isn't fast enough, etc. Thanks for any help!

Chris
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Old 15th November 2007, 06:18 AM   #8372
6h5c is offline 6h5c  Netherlands
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Hi Chris,

This one looks good. For muting, it's best to use a so called 'small signal' relay, with gold plated contacts. Most of the times you will not be switching any signal (that's called 'dry' switching), and this way the contact resistance is low enough to make sure the output is properly clamped to ground.

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Ray
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Old 15th November 2007, 08:00 AM   #8373
Chivvyp is offline Chivvyp  United Kingdom
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Quote:
Originally posted by RCruz

I got it right now.... The tant caps where innadecuate so I am using 120uF Pana between the common and the output in both cases and the output is now +-12V

Thank you

Ricardo

Hi,

The 10uF tants should be fine, I use them in my rayregs. Sounds like you maybe didn't get the polarity correct when you fitted them and they blew.

Regards

Pete
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Old 15th November 2007, 12:25 PM   #8374
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by Chivvyp
The 10uF tants should be fine, I use them in my rayregs. Sounds like you maybe didn't get the polarity correct when you fitted them and they blew.
Hi

maybe that´s true ... or maybe the caps where already faulty when I monted them.

Right now I am using 120uG Pana linking the outputs to the common ground in the regulators.

I am not following Ray´s schematic because I always noted a big drop in output whenever I placed the cap parallel to R2. in the LM337 -12v reg.

Can you comment on that ?

Best Regards

Ricardo
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Old 15th November 2007, 01:51 PM   #8375
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by RCruz
I am not following Ray´s schematic because I always noted a big drop in output whenever I placed the cap parallel to R2. in the LM337 -12v reg.

Can you comment on that ?

Best Regards

Ricardo
Beware that you have the polarity correct. For the LM337 the plus of the capacitors goes to GND.

Ray
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Old 15th November 2007, 02:05 PM   #8376
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Old 15th November 2007, 04:51 PM   #8377
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by 6h5c


Beware that you have the polarity correct. For the LM337 the plus of the capacitors goes to GND.

Ray

Thank you Ray

I am using the correct polarity but my schema is different from yours.

I did not put the cap in parallel with R2 as you indicated because I noticed a big drop in the output.

I decided to put the cap between pins 1 and 3 in the 337 with + linked to pin 1 (common ground).

I would like your comment on this setup before I install it in the CD53.

Best Regards

Ricardo
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Old 15th November 2007, 06:26 PM   #8378
6h5c is offline 6h5c  Netherlands
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Not good!

The cap must be parallel to the 1k05 resistor. If you have a drop in output voltage that way, then something else must be wrong. Are you sure you used the right pinning? LM337 is different from LM317! Try adding a 10...47u output capacitor. Maybe you have an oscillation problem.

Regards,

Ray
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Old 15th November 2007, 09:21 PM   #8379
Thomo is offline Thomo  United Kingdom
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I've finally got my discrete stage finished and fitted and it does sound good, especially considering that I have only used standard resistors and 7812/7912 regs.

One thing I am concerned about though, it is very, very quiet. About half as loud as with opamps, is this normal?

Lee.
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Old 15th November 2007, 10:33 PM   #8380
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by 6h5c
Not good!

The cap must be parallel to the 1k05 resistor. If you have a drop in output voltage that way, then something else must be wrong. Are you sure you used the right pinning? LM337 is different from LM317! Try adding a 10...47u output capacitor. Maybe you have an oscillation problem.

Regards,

Ray
Thank you Ray.... I added an output cap and now I have 12v sharp.

The 10uF is still parallel to the 1k05

Note:

I just replaced the opamps and want to remove the output caps.... but I have a 0.022V dc offset.

Can this value hurt my Meridian 101 PreAmp ?

Regards

Ricardo
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