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Van o.geerdink

Hero (587)

afbeelding van o.geerdink

20-08-2015, 14:32

Great work guys!

Van Omega

Master (231)

afbeelding van Omega

20-08-2015, 21:32

ericb59 wrote:

But, when those boards are playing digitalised sounds coming from the SRAM, the sound is crappy...
I don't understand where the problem come from... Do you have an idea ?


This must be a bad soldering / bad connection. Check out the sram chips with magnifying glass or microscope. (There are cheap usb microscopes available from China!) Also you can measure all pins of the srams for shorts. I know the layout of the board is really difficult with those srams so close to eachother.
If all fails, desolder the srams.. Would recommend a hot air station for they are so close..


Van roadfighter

Champion (438)

afbeelding van roadfighter

22-08-2015, 12:14

Meits wrote:

I guess the guy who did the modification already mailed you his findings. If not, I'll urge him to do so. He said it's like € 0,50 and half an hour of time. You won't believe your ears once it has been done Smile

Could you post the finding here so the people who already have there's. Can implement the chance? Maybe a picture of the board.
And as of the audio levels, the are personal but I would like to hear the difference.

Van ericb59

Paragon (1079)

afbeelding van ericb59

22-08-2015, 12:55

Tristan Z. contact me some week ago with a modification to increase the power output
here is modified schematic :

he add a 1K resistor and a 3.3K resistor on both channels on the IC8 chip (LF347)
Here a picture of the modification (Need to cut 2 tracks, so if you want to do it, you will have to be very careful !)

You have to know this modification also add some noises in the Amplification.
So, for myself, I prefer, a lower output wolume without noises !

In fact, I don't understand in what it is a problem if the output level is lower than other Moonblaster clones...
Just turn up a little more your external audio Amp, and that 's all ... :-?

Van roadfighter

Champion (438)

afbeelding van roadfighter

22-08-2015, 13:11

Thanks Eric, for the update.
I myself also think that less volume and noise is to be preferable to more volume.
But like I stated before, sound is personal.

Van meits

Scribe (6509)

afbeelding van meits

22-08-2015, 19:18

If you crank up the volume to meet Moonsound, you'll amplify the VDP noise as well.

Van ericb59

Paragon (1079)

afbeelding van ericb59

29-08-2015, 16:57

Hello all,

This message to say, now, all people who ordered a FM blaster must have received it.
I hope they enjoy it.

Thank you for your patience.
If someone want to buy a FM Blaster, he can contact me directly. I can build some again.

Van l_oliveira

Hero (534)

afbeelding van l_oliveira

29-08-2015, 23:55

You guys should give up using that horrible YAC513 chip and use a decent CD DAC like the Sanyo LC7881.

Will give much better audio quality and you won't even need eight OP AMPs to drive it.

Van inyigo

Champion (354)

afbeelding van inyigo

11-11-2015, 12:24

Hello Eric,

If you produce more cartridges I'm interested in one.

Van ericb59

Paragon (1079)

afbeelding van ericb59

11-11-2015, 13:36


i will produce an extra little batch in some weeks.
so... keep connected !

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