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 Post subject: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 08 Jul 2021, 15:09 
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Anyone modded a Pioneer D770/D703 for AC3 ?

Looking to add the capability ideally with a simple circuit and readily available components -
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 09 Jul 2021, 08:43 
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I will be modding a 703 in a few months.

For now, if you need tap points for it, it can be found here....

http://www.vellzen.us/laserdisc.html

This should be one of the more easier models to mod since everything is essentially labeled on the audio board.


Last edited by ldfan on 09 Jul 2021, 08:48, edited 2 times in total.
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 09 Jul 2021, 08:45 
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Ldfan i must salute your dedication and knowledge on AC3 for laserdisc.
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 09 Jul 2021, 15:06 
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Thanks for the link Ldfan very helpful.

For me definitely will need to be non SMD component & circuit board.


Last edited by d770 on 09 Jul 2021, 15:28, edited 1 time in total. _________________
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 09 Jul 2021, 15:26 
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Ldfan - Looking around the forum - I just found your excellent thread where you made a couple of AC3 boards.

https://forum.lddb.com/viewtopic.php?f=23&t=7827

Will you be using the same circuit and components for the D770/703 as you did for the Proscan?

I would def be more comfortable making the larger board - that is if it would fit ok.

So Potential AC3 Circuit parts list:

1x NTE123AP Transistor for Q1
1x DTA124ES Transistor for Q2
4x 0.1uF Capacitors for C1, C2, C3, C4
1x 100ohm Resistor for R1
1x 680ohm Resistor for R2
1x 10Kohm Resistor for R3
1x 100Kohm Resistor for R4
1x 75ohm Resistor for R5

1x RCA Socket for AC3 Output

1x Component Board
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 09 Jul 2021, 17:20 
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d770 wrote:
Will you be using the same circuit and components for the D770/703 as you did for the Proscan?


Yes. This board is pretty universal for any player that has a "mute active high" (MAH) point which I believe all North American and Japanese players would have. The only players that have "mute active low" (MAL) are European players so a slightly altered design would be needed.

d770 wrote:
I would def be more comfortable making the larger board - that is if it would fit ok.


The board can really fit anywhere but I know the minor difficulty w/ a 703 is that the audio board is way on top of the player so mounting would have to be from below. This might pose a minor challenge since that means running wires from the top board and leaving enough strain relief back to the AC3 board wherever it may be mounted (remember, this audio board can flip up for maintenance so you need to ensure proper strain relief to avoid the wires getting pulled too much).

d770 wrote:
So Potential AC3 Circuit parts list:

1x NTE123AP Transistor for Q1
1x DTA124ES Transistor for Q2
4x 0.1uF Capacitors for C1, C2, C3, C4
1x 100ohm Resistor for R1
1x 680ohm Resistor for R2
1x 10Kohm Resistor for R3
1x 100Kohm Resistor for R4
1x 75ohm Resistor for R5

1x RCA Socket for AC3 Output

1x Component Board



That is essentially all the parts you need plus some color coded wiring for the points and RG179 coax cable (I think; need to double check that) for the signals to travel within the player (AFM and AC3-RF). Also, I have been hearing from others that DTA-124ES might not be available anymore but a reasonable substitute can be obtained as it's just a generic PNP transistor. You can probably do a search and see what comes up for a recommended replacement. I'll be looking into it as well since I think I'm down to my last 2 or 3 now.
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 12 Jul 2021, 08:13 
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Got most parts already - Double sided Prototype board coming in the post - however bit of trouble finding Transistors locally in Australia - found a supply on ebay uk...which is ok but will takes ages. Capacitors found some tantulum and polyester 0.1uF ...which is best for this purpose !?

EDIT:
I can obtain a DTC124ES from a local supplier - I believe it has the same characteristics and built-in bias resistor as the DTS124ES transistor. Datasheet below.
https://www.digchip.com/datasheets/part ... ES-pdf.php

The NTE123AP NPN specifically seems harder to find in Australia..
I have found a few NPN General Purpose Amplifier Transistors available locally..characteristics are not 100% same..similar though - are most suitable ?

PN100 - Datasheet:
https://www.jaycar.com.au/medias/sys_ma ... etMain.pdf

Or

2N2222A - Datasheet:
https://www.jaycar.com.au/medias/sys_ma ... etMain.pdf

Or
BC547 - Datasheet:
https://www.sparkfun.com/datasheets/Com ... /BC546.pdf

Versus

NTE123AP - Datasheet:
https://components101.com/asset/sites/d ... asheet.pdf
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 13 Jul 2021, 05:07 
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d770 wrote:
Capacitors found some tantulum and polyester 0.1uF ...which is best for this purpose !?


The one's I use are polyester but I'm sure tantulum would be fine too. So long as they are 0.1uf. The only purpose of these caps is for filtering noise.


d770 wrote:
EDIT:
I can obtain a DTC124ES from a local supplier - I believe it has the same characteristics and built-in bias resistor as the DTS124ES transistor. Datasheet below.
https://www.digchip.com/datasheets/part ... ES-pdf.php

The NTE123AP NPN specifically seems harder to find in Australia..
I have found a few NPN General Purpose Amplifier Transistors available locally..characteristics are not 100% same..similar though - are most suitable ?

PN100 - Datasheet:
https://www.jaycar.com.au/medias/sys_ma ... etMain.pdf

Or

2N2222A - Datasheet:
https://www.jaycar.com.au/medias/sys_ma ... etMain.pdf

Or
BC547 - Datasheet:
https://www.sparkfun.com/datasheets/Com ... /BC546.pdf

Versus

NTE123AP - Datasheet:
https://components101.com/asset/sites/d ... asheet.pdf



I looked over these fairly quickly and I don't think there should be an issue using any of them. They all have similar voltage ratings which are all within the range of this very simple circuit. Just make sure you have the base, collector, and emitter wired up correctly in the circuit. Here are updated pics I made showing the transistor points as well as resistor / transistor locations in my circuit.

Image

Image
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 Post subject: Re: AC3 Mod Circuit for Pioneer D770 (D703) ?
PostPosted: 13 Jul 2021, 14:38 
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Thanks Ldfan ... Transistors on order !

As soon as the proto board arrives - will start assembly.

Thanks much also for posting the xtra photos...all helps make for more chance of a successful mod!
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