Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Discussion about old sound cards, MIDI devices and sound related accessories.

Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2018-12-25 @ 14:27

fox.jpg


fox1.jpg


All PC-Speaker issues are fixed now and now its also short circuit safe.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby carlostex » 2018-12-28 @ 14:17

Great job, very nice to see this progress.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby JonSmith » 2019-1-02 @ 08:30

Thumbs up! Can't wait!
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby carlostex » 2019-1-02 @ 11:27

I'm interested in a couple of PCB's, if you plan to make them available.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby keropi » 2019-1-02 @ 11:53

matze79 are these changes documented so I can replicate them?
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2019-1-02 @ 14:43

more or less :)

i send you a PM keropi.

Carlostex, we working out the bugs, i'm sure it will be avaible soon on serdaco :)
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby ITzTravelInTime » 2019-1-09 @ 00:27

I hope you post some pcb files or something like that, i'd like to play with the disgn a little bit (just to match the holes and the headphone jack position to use the metal bracket i use for the adlib clone) and also because i'd like to build one from scratch, what a bout availability in the future? i'd like to use it with my upcoming pc xt build
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2019-1-09 @ 10:10

matze79 wrote:more or less :)

i send you a PM keropi.

Carlostex, we working out the bugs, i'm sure it will be avaible soon on serdaco :)


I also still have one of your early prototype boards. Any chance I can upgrade it as well?
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby mil » 2019-1-13 @ 14:33

I am also interested in a couple of PCB's.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2019-1-13 @ 15:38

Just have a little patience :) until ~ spring 2019!
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2019-3-09 @ 13:51

still some small adjustments needed, current progress :

3voice_next.jpg
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby Scali » 2019-3-09 @ 14:09

Looks great! I love the volume wheel!
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2019-3-09 @ 20:37

God we need someone with a tool for making custom brackets. But yeah, looks lovely!
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby keropi » 2019-3-09 @ 21:52

yep - it looks very nice !
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2019-3-10 @ 16:00

root42 wrote:God we need someone with a tool for making custom brackets. But yeah, looks lovely!


ah i already have a solution for that into mind :)
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2019-3-10 @ 18:31

Then also make some for the snark barker!!
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2019-3-15 @ 15:42

looks lovley but has EMV problems.. so needs redesign i cut few things on the pcb and wired the gnd and vcc directly to power supply and so on..
still noise inside the signal.

my two testing boards on perfboard did work fine.. so it must have todo with the pcb design..
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby root42 » 2019-3-15 @ 15:48

That is something that eludes me completely. How does one go about reducing noise on the PCB level? I remember one video by Dave from EEVblog where he simply added two layers to an already two layer board, simply by adding one pure GND and VCC plane, iirc. That supposedly reduced emissions as well. Not sure about the physics behind that.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby matze79 » 2019-3-15 @ 17:19

this way parasitic capacitance is eliminated i think.
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Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Postby Tiido » 2019-3-15 @ 17:30

Planes increase parasitic capacitance, which (un)intentionally helps to round off the signal edges slightly which will reduce emissions. Their main positive effect comes from reduction of loop area on return currents etc., the noise can couple straight into the plane rather than through other stuff elsewhere, so less has to radiate outwards or into other stuff.
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