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Another amp
Another amp
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Old 17th January 2009, 04:06 AM   #291
anatech is offline anatech  Canada
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Another amp
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.

"Just because you can, doesn't mean you should" my Wife
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Old 17th January 2009, 01:23 PM   #292
thunderstruck is offline thunderstruck  Belgium
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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.
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Old 18th January 2009, 12:17 AM   #293
nigelwright7557 is offline nigelwright7557  United Kingdom
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Location: Carlisle, England
Originally posted by NickC
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.
PCBCAD51 download or CDROM 2019 version out now http://www.murtonpikesystems.co.uk
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Old 6th May 2011, 01:04 AM   #294
yeshua is offline yeshua
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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?

Antonio Franca
City of Brasilia Brazil

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Old 16th June 2012, 10:12 AM   #295
dnkwenti is offline dnkwenti  Dubai
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Default Help to build the M250 power amplifier

Please can someone help me with the replacements of this transistors, MJE 340/350 , I wish to build the M250 power amp but can't fine the transistors.....Thanks
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Old 16th June 2012, 10:14 AM   #296
dnkwenti is offline dnkwenti  Dubai
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Default I need to build a good Amplifier

Please i will like to plead that can someone help me with a working schematic of an Audio Amplifier that can deliver 250watts into 8ohms....i need it for my studio project.
any help will be appreciated.
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