where to tap +5V.UPDATED with pics!

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Sprites Lover

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hi,ive seen some consolized mvs unit with little wires.I wonder which point u guys tap the +5v and ground from.Is there a tread with pictures here or is this some sort of 'trade secret' within the neo community?
 
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werejag

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if your consoling a mvs tap from the bottom, use a multimeter to find a a spot away from the jamma edge
 
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werejag said:
if your consoling a mvs tap from the bottom, use a multimeter to find a a spot away from the jamma edge
Click to expand...

ok so it means tapping +5v from one point on the jamma edge will do to power up the whole mvs?If that is so,how come the mvs is designed to have many +5v pinout on the jamma edge?What's the theory behind this?
 
ttooddddyy

ttooddddyy

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Sprites Lover said:
ok so it means tapping +5v from one point on the jamma edge will do to power up the whole mvs?If that is so,how come the mvs is designed to have many +5v pinout on the jamma edge?What's the theory behind this?
Click to expand...

It is to reduce the voltage drop in the harness from the psu and the heat at the jamma/mvs edge connects.
An MVS mobo can draw up to 5 amps depending on model, so the edge connects can get hot and toasty.
A single decent gauge 5 volt connecting wire will suffice, you do not need them all connected, but the more the merrier for the sake of reliability..
 
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ttooddddyy said:
It is to reduce the voltage drop in the harness from the psu and the heat at the jamma/mvs edge connects.
An MVS mobo can draw up to 5 amps depending on model, so the edge connects can get hot and toasty.
A single decent gauge 5 volt connecting wire will suffice, you do not need them all connected, but the more the merrier for the sake of reliability..
Click to expand...

ah ic.now i get it.So for the Ground any ground will do i suppose since ground is common?And for the controller ports just trace with multimeter .i got a fully working consolized mvs with jamma connectors,db15 ports and PC PSU ,im looking forward to further streamline the mobo.Im thinking of using a Switching Power Supply Adapter which is selectable to 5V ,3amp.The place where i live in,i cant acquire the Jameco 5V power adapter.So will a switching power supply adapter have adverse effect on the mobo compared to those fixed 5V jameco power supply?
 
werejag

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ive used the other 5vlt connections as power return for encoders etc
 
ttooddddyy

ttooddddyy

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The same goes for the grounds, as many as is practical is good ;)

An arcade type smps supply is ideal, after all said that is what mvs was designed to run off, and they can usually supply up to 15 amps.
 
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Xian Xi

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The only Neo board that needs +5v on all 4 pins is the Hyper 64.

Otherwise you can tap the +5v from pretty much anywhere. A lot of people like to solder to the leg of a cap connected to the +5v trace.
 
werejag

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in my supergun which i made the video encoder is not connected to ground until its connected to the jamma connector. kind of a safety way.
 
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werejag said:
in my supergun which i made the video encoder is not connected to ground until its connected to the jamma connector. kind of a safety way.
Click to expand...

wat do u mean by "not connected to ground until its connected to the jamma connector"? btw where u usually tap the RGB,sync lines in MV1A/C?
 
werejag

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meaning the grounds of the encoder get connected via the jamma grounds . return ground.
 
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alright,i have hooked up and theres picture.But now there are no sound .I hv done the stereo mod on the MV1A.Is it because i need to tap power to the audio amp??
 
Xian Xi

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Make sure you try playing the game because if its only looping through attract mode the sound might be off for it.
 
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hmmm i thought even if in Demo Sound 'OFF' the neo geo boot up jingle still have sound?ok i check snd confirm.The problem is i havent connect the controller ports yet..
 
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ok i connected a Test switch to start a game.There is a credit sound each time i press it but when the game starts,there is no sound.i tried with other cartridges and its the same.
 
Xian Xi

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If thats the case it sounds like you didnt tap the right points since you are only getting sound effects.
 
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hmmmm..i go check again the points.I have get it work before for stereo mod on the mv1a.its R77,78 and the yamaha pin 27.
 
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there is still no sound during gameplay,only 'credit insert' sound can be heard each time i insert credits.Is it because there is no +12V on the TA8201 chip?Im using a +5v 3A power supply now instead of a PSU power supply previously.
 
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werejag

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since you are not using +12 you need to mod your board do a search it been discused before
 
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