teac AL700p center card

shmulik · 13th January 2007, 05:25 PM

someone gave me a center unit that was taken out of the box of a Teac AL700P. can someone guide me how to put it into use?
seems like the board needs 5V for logic, 12V for relays, and 28V for amplifier. there seems to be some input other than signal - power_on, speaker_on and protect - what are these (12V?)? how to drive them?
And - what PS is recommended (for each type of voltage)?
on the original box, the PS had 5V regulator on both the PCB of the PS and on the main board - the one that holds the channel amplifiers - why?

I know that's a lot of questions, so if there are answers somewhere on the web - please point me to it. searching the forums yielded very little.

RonD2 · 21st January 2008, 07:57 PM

Schmulik,

Did you ever get the extra Teac board running?

I am trying to do the same but can't figure out what to do with the - power_on, speaker_on and protect pins. I have 24v and 5v to the board but can't get it to "turn on".

Any help will be appreciated. The 2050 can sound great so the effort should be worth it!

Thanks!

Ron

Puffin · 21st January 2008, 08:27 PM

I have got a whole Teac AL700P that I am part way through modding. I will need to check again, but I think that the main board (into which the unit you have locates) needs 24v, 15v and 5v. I am going to make up another PS for it and remove the SMPS.

Is there no schematic anywhere for this ?

tripathdude · 27th January 2008, 03:48 AM

I have totally modded the heck out of my Teac A-L700P. It uses a Jensen 10,000uf 40v for the main power supply cap and Jensen oil 2.2uf cooper coupling capacitors. Inductors were upgraded. The input resistors were changed from smd resistors to riken-ohm resistors. The output filter supply was hard wired with new caps and mills resistors to tripath specs with the speaker relays bypassed. I wish I could take pictures to show you how everything is hook up. Here is a diagram I used for turning the amp into battery power.

You do not have to worry about powering the relays since you are bypassing them, but you need to power the protect-on, speaker-on, etc. My millimeter reads them at 3.5v, but I think you can get by with 5v. There is a 5v regulator on the main board which I power with one of the 12v batteries. When the amp is powered on, the batteries connect in series to produce 24v and parallel when charging.

Puffin · 27th January 2008, 10:42 AM

Tripathdude. Have I got it wrong ? Do I only need 24v and 12v to the 7805 on board ?

Do you have any pictures of where I should connect up to ?

Puffin · 27th January 2008, 11:33 AM

Tripathdude.

http://i73.photobucket.com/albums/i2...onsex/Teac.jpg

Can I ask you some questions regarding the ringed area above.

1. Is the rectifier the Voltage regulator ?
2. If so I believe the pin outs are 1-in, 2-Grd, 3-out ?
3. Does the – 24v attach to the Grd and Out legs of the regulator or is the diagram misleading

tripathdude · 27th January 2008, 08:22 PM

The rectifier is the voltage regulator. You need to send the 12v to the line in which I think is on the left pin. Check with a multimeter to make sure! The ground is the middle pin so test the voltage on both pins to make sure which is the input and which is the output.

The schematic is confusing, and I thought it wouldn't work, but works like a charm. When the batteries are charging they are hooked in parallel which feeds the -24v of the battery to the regulator, but when the switch is engaged to on, the line turns to a 12v line. I hope this helps.

RonD2 · 27th January 2008, 09:25 PM

tripathdude,

I have your battery supply wired up and working. Thanks for this!

I want to use it to power the "extra" board as a second amp. Can this done, i.e. can it be used without the main board?

I would love to see a picture of your amp. If at all possible, please post one!

I have modded mine some but still use the smps (with larger caps). I run the input straight in (removing the small input caps) through 2.2 uF Auricaps and use a 35V BG on the amp board.

I think this amp sounds great.

I want to try the battery supply but was hoping to wind up with two working amps to compare. If this is not possible, I will replace the smps on the main unit with the batteries and would love to see your layout.

Thanks for your help!

Ron

wendell · 28th January 2008, 05:37 AM

tripathdude, is your mod the same as Rossi's of RedWIneAudio?

wendell · 28th January 2008, 06:35 AM

RonD2, I believe the main board is needed. I have the battery mod also which is the mods that RWA offered a few years back.

13th January 2007, 05:25 PM	#1
shmulik diyAudio Member Join Date: Aug 2004 Location: country side	teac AL700p center card someone gave me a center unit that was taken out of the box of a Teac AL700P. can someone guide me how to put it into use? seems like the board needs 5V for logic, 12V for relays, and 28V for amplifier. there seems to be some input other than signal - power_on, speaker_on and protect - what are these (12V?)? how to drive them? And - what PS is recommended (for each type of voltage)? on the original box, the PS had 5V regulator on both the PCB of the PS and on the main board - the one that holds the channel amplifiers - why? I know that's a lot of questions, so if there are answers somewhere on the web - please point me to it. searching the forums yielded very little.

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21st January 2008, 07:57 PM	#2
RonD2 diyAudio Member Join Date: Dec 2004 Location: MA	Schmulik, Did you ever get the extra Teac board running? I am trying to do the same but can't figure out what to do with the - power_on, speaker_on and protect pins. I have 24v and 5v to the board but can't get it to "turn on". Any help will be appreciated. The 2050 can sound great so the effort should be worth it! Thanks! Ron

21st January 2008, 08:27 PM	#3
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	I have got a whole Teac AL700P that I am part way through modding. I will need to check again, but I think that the main board (into which the unit you have locates) needs 24v, 15v and 5v. I am going to make up another PS for it and remove the SMPS. Is there no schematic anywhere for this ?

27th January 2008, 10:42 AM	#5
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	Tripathdude. Have I got it wrong ? Do I only need 24v and 12v to the 7805 on board ? Do you have any pictures of where I should connect up to ?

27th January 2008, 11:33 AM	#6
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	Tripathdude. http://i73.photobucket.com/albums/i2...onsex/Teac.jpg Can I ask you some questions regarding the ringed area above. 1. Is the rectifier the Voltage regulator ? 2. If so I believe the pin outs are 1-in, 2-Grd, 3-out ? 3. Does the – 24v attach to the Grd and Out legs of the regulator or is the diagram misleading

27th January 2008, 08:22 PM	#7
tripathdude diyAudio Member Join Date: Mar 2007	The rectifier is the voltage regulator. You need to send the 12v to the line in which I think is on the left pin. Check with a multimeter to make sure! The ground is the middle pin so test the voltage on both pins to make sure which is the input and which is the output. The schematic is confusing, and I thought it wouldn't work, but works like a charm. When the batteries are charging they are hooked in parallel which feeds the -24v of the battery to the regulator, but when the switch is engaged to on, the line turns to a 12v line. I hope this helps.

27th January 2008, 09:25 PM	#8
RonD2 diyAudio Member Join Date: Dec 2004 Location: MA	tripathdude, I have your battery supply wired up and working. Thanks for this! I want to use it to power the "extra" board as a second amp. Can this done, i.e. can it be used without the main board? I would love to see a picture of your amp. If at all possible, please post one! I have modded mine some but still use the smps (with larger caps). I run the input straight in (removing the small input caps) through 2.2 uF Auricaps and use a 35V BG on the amp board. I think this amp sounds great. I want to try the battery supply but was hoping to wind up with two working amps to compare. If this is not possible, I will replace the smps on the main unit with the batteries and would love to see your layout. Thanks for your help! Ron

28th January 2008, 05:37 AM	#9
wendell diyAudio Member Join Date: Mar 2004 Location: Las Vegas, NV	tripathdude, is your mod the same as Rossi's of RedWIneAudio?

28th January 2008, 06:35 AM	#10
wendell diyAudio Member Join Date: Mar 2004 Location: Las Vegas, NV	RonD2, I believe the main board is needed. I have the battery mod also which is the mods that RWA offered a few years back.

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