Another amp - Page 30

anatech · 17th January 2009, 04:06 AM

Hi thunderstruck,
You probably have a low voltage supply already, used for "housekeeping" in your amp. You will need power to run the circuit that "tells" the relay to close or open.

If you don't, you could use a resistor to drop the voltage from one supply, or use a regulator to drop the voltage. I don't think you want yet another cord to plug in, so "wall warts" are out.

Can you post your details of the amp? The current draw of the relay will be important also. It is possible you might be better off with a relay rated at another common voltage. They come with coils rated at 5V, 6V, 12V, 24V and 48V most commonly. The nice thing here is that the required current drops as the voltage rating is increased. The same coil power is required.

If this is not easy for you, post the schematic of the protection circuit and amplifier. Then we can give you answers that will apply to what you are doing.

-Chris

thunderstruck · 17th January 2009, 01:23 PM

http://marcusgun.awardspace.com/m250.html

these are the details about the amp and DC protection.
so that is what I tought ,I have to make a 12V DC supply.
tnx for the answer.

nigelwright7557 · 18th January 2009, 12:17 AM

Quote:

Originally posted by NickC
[B]marcus
how about decoupling the output section from the driver and ltp section via 10 ohm resistor and 470uf cap
helps in preventing any noise from the output section entering the cruical low noise areas(ltp)

I did this with my amp and I also noticed there was a lot less hum with no signal present.

yeshua · 6th May 2011, 01:04 AM

Hello Marcus,

I found it very good M-250 and would like to mount the M-250 you would have the design of printed circuit board of the M-250?

Grateful
Antonio Franca
City of Brasilia Brazil

17th January 2009, 04:06 AM	#291
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi thunderstruck, You probably have a low voltage supply already, used for "housekeeping" in your amp. You will need power to run the circuit that "tells" the relay to close or open. If you don't, you could use a resistor to drop the voltage from one supply, or use a regulator to drop the voltage. I don't think you want yet another cord to plug in, so "wall warts" are out. Can you post your details of the amp? The current draw of the relay will be important also. It is possible you might be better off with a relay rated at another common voltage. They come with coils rated at 5V, 6V, 12V, 24V and 48V most commonly. The nice thing here is that the required current drops as the voltage rating is increased. The same coil power is required. If this is not easy for you, post the schematic of the protection circuit and amplifier. Then we can give you answers that will apply to what you are doing. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

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17th January 2009, 01:23 PM	#292
thunderstruck diyAudio Member Join Date: Oct 2008	http://marcusgun.awardspace.com/m250.html these are the details about the amp and DC protection. so that is what I tought ,I have to make a 12V DC supply. tnx for the answer.

6th May 2011, 01:04 AM	#294
yeshua diyAudio Member Join Date: May 2011	Hello Marcus, I found it very good M-250 and would like to mount the M-250 you would have the design of printed circuit board of the M-250? Grateful Antonio Franca City of Brasilia Brazil

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