IntregalOverloadOutput on a G R Sloane Amp

1965GTO · 1st May 2009, 11:14 PM

Hello,
A few years ago I purchased from DIYAMP.net a totem pole amp. It is a GRSlone design. On this board is a terminal block point called a Intergal Overload Output. What am I supposed to hook it up too? It is driving me crazy. I looked through the books, searched, queryed and no answer or response.

Can anyone help? Does this go to a ground of some kind. Here is a snapshot of the schematic section showing how it ties into the amp board then runs off to a ground symbol.

What is that something??

1965GTO · 1st May 2009, 11:15 PM

Here is the picture of the amp board showing the terminal block actual location.

Jan Dupont · 2nd May 2009, 04:09 AM

It looks like a protection circuit (hense the name "overload output").
Even that some parts of the schematic is missing, my guess would be that Q13 detects overload and pulls Q23 On, which gives a positive output on the IOL terminal. This may have connection to an external protection circuit........

Samuel Jayaraj · 2nd May 2009, 10:01 AM

My guess is that it connects to an LED which lights up when the VI limiting kicks in; just a guess.

vid · 10th May 2009, 09:47 PM

Hi!

I have talked to Randy Slone about the IOP output.

Material on a Bluray or DVD can cause high level transients to overload the amplifier. Accumulated activations (2-3 /sec is normal and false) eg. 100 times / sec is abnormal and the IOP circuit will short the drive signal.

You must connect the IOP output terminal to the Fig. 8.5 AUX-board ('The Audiophiles project source book'). Solder it to the point between Rin and BR1. The IOP circuit will drop-on the muting relay to disconnect the speakers.

I am finishing my totem pole amplifier, working now with the cabinet. I have not testet the IOP circuit yet. I hope it will work out fine!

Vid

Samuel Jayaraj · 10th May 2009, 10:11 PM

Could you please PM me Randy's contact mail id etc., I want to contact him on a more personal note, to continue from where we left off last time. By the way it has nothing to do with audio. Thanks.

vid · 14th May 2009, 07:29 PM

You can reach Randy by e-mail:

sealelec@mikrotec.com

Vid

vid · 18th May 2009, 04:01 PM

1965GTO - Have you tried connecting the IOP terminal to the AUX-board?

Vid

2nd May 2009, 04:09 AM	#3
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	It looks like a protection circuit (hense the name "overload output"). Even that some parts of the schematic is missing, my guess would be that Q13 detects overload and pulls Q23 On, which gives a positive output on the IOL terminal. This may have connection to an external protection circuit........ __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

2nd May 2009, 10:01 AM	#4
Samuel Jayaraj diyAudio Member Join Date: May 2001 Location: Bangalore, India	My guess is that it connects to an LED which lights up when the VI limiting kicks in; just a guess. __________________ Sam

10th May 2009, 10:11 PM	#6
Samuel Jayaraj diyAudio Member Join Date: May 2001 Location: Bangalore, India	Could you please PM me Randy's contact mail id etc., I want to contact him on a more personal note, to continue from where we left off last time. By the way it has nothing to do with audio. Thanks. __________________ Sam

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10th May 2009, 09:47 PM	#5
vid diyAudio Member Join Date: Sep 2004 Location: Norge	Hi! I have talked to Randy Slone about the IOP output. Material on a Bluray or DVD can cause high level transients to overload the amplifier. Accumulated activations (2-3 /sec is normal and false) eg. 100 times / sec is abnormal and the IOP circuit will short the drive signal. You must connect the IOP output terminal to the Fig. 8.5 AUX-board ('The Audiophiles project source book'). Solder it to the point between Rin and BR1. The IOP circuit will drop-on the muting relay to disconnect the speakers. I am finishing my totem pole amplifier, working now with the cabinet. I have not testet the IOP circuit yet. I hope it will work out fine! Vid

14th May 2009, 07:29 PM	#7
vid diyAudio Member Join Date: Sep 2004 Location: Norge	You can reach Randy by e-mail: sealelec@mikrotec.com Vid

18th May 2009, 04:01 PM	#8
vid diyAudio Member Join Date: Sep 2004 Location: Norge	1965GTO - Have you tried connecting the IOP terminal to the AUX-board? Vid

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