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1000W Simple PA Amplifier
1000W Simple PA Amplifier
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Old 28th September 2018, 07:37 PM   #1021
steveu is offline steveu  United States
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The 10 Ohm resistor and 10uH choke is (or should be) part of the amplifier. The choke is an "build-out" impedance that prevents the speaker cable from shorting the amplifier feedback at high frequencies and making the amp oscillate. The 10 Ohm resistor is a damper for the choke, that prevents the choke from ringing at it's resonant frequency. The current path for audio frequencies is though the choke, not the resistor.
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Old 29th September 2018, 07:35 AM   #1022
Lakota Wanagijata is offline Lakota Wanagijata  Ireland
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Quote:
Originally Posted by steveu View Post
The 10 Ohm resistor and 10uH choke is (or should be) part of the amplifier. The choke is an "build-out" impedance that prevents the speaker cable from shorting the amplifier feedback at high frequencies and making the amp oscillate. The 10 Ohm resistor is a damper for the choke, that prevents the choke from ringing at it's resonant frequency. The current path for audio frequencies is though the choke, not the resistor.
Thanks for quick response.
i decide to buy finish product i will put this protection in my 2 channel amp.


UPC1237 30A High Power Stereo Speaker Protection Board OMRON Relay AC 12V-16V | eBay
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Old 29th September 2018, 06:43 PM   #1023
44250 is offline 44250  Serbia
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those relays on protection from link you have shared are the best one I could find for this purpose,without too high price tagged on. I use on my protections same type but other manufacturer. as far as I could say-good choice! good luck with project!
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Old 30th September 2018, 10:57 PM   #1024
john_ellis is offline john_ellis  United Kingdom
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I have not trawled through all of this thread, but I can't believe this circuit will work well. The protection transistors are shown in post #1 with 1uF capacitors between C&B. Surely, these will try to clamp the signal from the drivers under normal use?
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Old 9th November 2018, 08:06 AM   #1025
apexaudio is offline apexaudio  Serbia
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BA 900
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File Type: jpg APEX BA 900.jpg (111.8 KB, 181 views)
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Old 9th November 2018, 09:24 AM   #1026
Gurpreet Turna is offline Gurpreet Turna  India
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BA 900
Is 500ohm dc setting?
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Gurpreet
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Old 9th November 2018, 11:24 AM   #1027
apexaudio is offline apexaudio  Serbia
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Originally Posted by Gurpreet Turna View Post
Is 500ohm dc setting?
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Gurpreet
Yes output DC offset setting.
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Old Today, 06:06 AM   #1028
wendipassundan is offline wendipassundan  Indonesia
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please help high resolution images Sir. ( #1025.. thank you
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