Audio Amplifier protections

aguantesoda · 28th February 2007, 11:52 PM

¡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.

gni · 1st March 2007, 03:23 AM

Try http://sound.westhost.com/

destroyer X · 1st March 2007, 10:32 AM

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

aguantesoda · 1st March 2007, 03:51 PM

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?

Dick West · 1st March 2007, 04:24 PM

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

aguantesoda · 2nd March 2007, 02:20 PM

ok, thanks!

AndrewT · 2nd March 2007, 04:13 PM

Hi,
that 39k collector load cannot be right.
1 or 2k should be nearer the required value.

aguantesoda · 4th March 2007, 05:17 PM

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

aguantesoda · 12th April 2007, 02:08 AM

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

ifrythings · 12th April 2007, 02:58 AM

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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1st March 2007, 03:23 AM	#2
gni diyAudio Member Join Date: Sep 2006	Try http://sound.westhost.com/

1st March 2007, 04:24 PM	#5
Dick West diyAudio Member Join Date: Aug 2004 Location: Illinois	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

2nd March 2007, 02:20 PM	#6
aguantesoda diyAudio Member Join Date: Aug 2006 Location: Buenos Aires	ok, thanks!

2nd March 2007, 04:13 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, that 39k collector load cannot be right. 1 or 2k should be nearer the required value.