[ukvac] [Tech] Space Invaders amplification circuit
OK I've got some midway 8080 mobos working now, come up with my own
ram tester I'll expain later .... anyway onto the next problem.
I have 3 SI daughter boards, and they all are not putting any sound
out at all (no hiss or pop or anything) I assume that I have wired
something wrong as I didn't expect all 3 to have absolutely no sound.
I've wired Audio+ to 12v and return to common ground, speaker to pin
8 and 9.
Within about 20 seconds of being on the heatsink on the amp is too
hot to touch (on all 3 boards)
Is is normal for it to get this hot?
Should the powersupply for the sound be isolated from the main board
power supply .. hence the seperate ground connection ??
I can't test it in a real cab as mine is in storage.
Thanks in advance for any info
Luke
OK I've got some midway 8080 mobos working now, come up with my own
ram tester I'll expain later .... anyway onto the next problem.
I have 3 SI daughter boards, and they all are not putting any sound
out at all (no hiss or pop or anything) I assume that I have wired
something wrong as I didn't expect all 3 to have absolutely no sound.
I've wired Audio+ to 12v and return to common ground, speaker to pin
8 and 9.
Within about 20 seconds of being on the heatsink on the amp is too
hot to touch (on all 3 boards)
Is is normal for it to get this hot?
Should the powersupply for the sound be isolated from the main board
power supply .. hence the seperate ground connection ??
I can't test it in a real cab as mine is in storage.
Thanks in advance for any info
Luke