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Audio Amplifier protections
Audio Amplifier protections
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Old 28th February 2007, 11:52 PM   #1
aguantesoda is offline aguantesoda  Argentina
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Default Audio Amplifier protections

¡Hola!, trato de hacer una protección para los Tips, y los Parlantes, para mi amplificador de audio, pero no sé como realizarlo.

Las características:

Vcc: 45 - 0 - 45
RL: 8 ohms

Si podés ayudarme...
Acá está el circuito.

Hello, I am trying to make a protection for the Tips, and the speakers, for my audio amplifier, but i do not know how.

The characteristics:

Vcc: 45 - 0 - 45
RL: 8 ohms

If you can help me...
Here is the circuit.
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Old 1st March 2007, 03:23 AM   #2
gni is offline gni  United States
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Try http://sound.westhost.com/
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Old 1st March 2007, 10:32 AM   #3
destroyer X is offline destroyer X  Brazil
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Default Intall, please, the missed zobel filter.

Also the third output base was missed....just complete in your diagram...those bases are joined together.

I do not know why people forgot the stop resistors in series with the output bases...well...if working this way it is OK!

regards,

Carlos
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Old 1st March 2007, 03:51 PM   #4
aguantesoda is offline aguantesoda  Argentina
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If a problem happens in the amplifier; the Tips will be hottest, and it is dangerous for the Tips. So, how can I install a protection for it?

si ocurriese un problema en el amplificador; los tips comenzarán a calentar y podría llegar a dañarlos. Entoces, como hago para proteger a los tips; y evitar q se quemen?
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Old 1st March 2007, 04:24 PM   #5
Dick West is offline Dick West  United States
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Install a thermal switch in series with the incoming AC voltage. Study the schematics and wiring layout of the Hafler DH series. Mount the thermal sensing switch on the heat sink next to the output devices.

http://www.hafler.com/techsupport/pd...00_amp_man.pdf
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Old 2nd March 2007, 02:20 PM   #6
aguantesoda is offline aguantesoda  Argentina
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ok, thanks!
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Old 2nd March 2007, 04:13 PM   #7
AndrewT is offline AndrewT  Scotland
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Hi,
that 39k collector load cannot be right.
1 or 2k should be nearer the required value.
__________________
regards Andrew T.
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Old 4th March 2007, 05:17 PM   #8
aguantesoda is offline aguantesoda  Argentina
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Quote:
Originally posted by AndrewT
Hi,
that 39k collector load cannot be right.
1 or 2k should be nearer the required value.

yes, sorry; the 39k collector load it´s not right;
it is 3k.

here is the circuit
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Old 12th April 2007, 02:08 AM   #9
aguantesoda is offline aguantesoda  Argentina
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I have made a Short Circuit Protection with an article post in http://sound.westhost.com/vi.htm

It is ok?

Source: + - 45V

RL: 4 u 8 ohms
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Old 12th April 2007, 02:58 AM   #10
ifrythings is offline ifrythings  Canada
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I've seen lots of pro amps use this circuit (alost the same as yours but a bit modified

P.S look up uPC1237 IC, it can give you delay turn on to get rid of turn on/off thump , DC detection and load removal, and over-current load removal(via relay).
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