This is a very odd, but probably quite basic electric problem that I just can't figure out. I've tried to give as much information as possible, and linked to all the products used.
This amp (13.8v, 3A @ 50% duty cycle) just arrived in the post to power my Sonic Impact t-amp. Lostcause on this forum reports using this PSU with this amp without problem on this thread
I made up a black and red bare-wire to DC plug cable, centre red, hooked everything up and... nothing! The t-amp power light doesn't come on.
Some tests I ran to find the problem:
1) To test the PSU and cable, I got a 12v DC desk fan, stripped the wires and touched them against the DC plug attached to the PSU. Spins as usual, in the right direction.
2) To test the T-amp isn't damaged I loaded it up with AA cells. Works fine, sounds good!
3) To test the T-amp 12v DC-in port, I connected a "molex" (ATA hard drive connector) to the bare-wire end of the cable and connected it to my computer PSU. Powers on fine, sounds OK (PSU power is very noisy).
I'm ripping my hair out here - it's probably something simple I've not thought of. Any ideas? It seems everything works on its own, but not when put together!
This amp (13.8v, 3A @ 50% duty cycle) just arrived in the post to power my Sonic Impact t-amp. Lostcause on this forum reports using this PSU with this amp without problem on this thread
I made up a black and red bare-wire to DC plug cable, centre red, hooked everything up and... nothing! The t-amp power light doesn't come on.
Some tests I ran to find the problem:
1) To test the PSU and cable, I got a 12v DC desk fan, stripped the wires and touched them against the DC plug attached to the PSU. Spins as usual, in the right direction.
2) To test the T-amp isn't damaged I loaded it up with AA cells. Works fine, sounds good!
3) To test the T-amp 12v DC-in port, I connected a "molex" (ATA hard drive connector) to the bare-wire end of the cable and connected it to my computer PSU. Powers on fine, sounds OK (PSU power is very noisy).
I'm ripping my hair out here - it's probably something simple I've not thought of. Any ideas? It seems everything works on its own, but not when put together!
Fair comment.
There aren't any electronics shops in my town but no use messing around: so I just bought a digital multimeter on ebay using buyitnow for a tenner including delivery.
Ah... I remember using these things at college... I've been meaning to get one for years.
I'll measure the PD across the terminals when it gets here and post. In the meantime, I'm still really puzzled by every component working fine but the whole system failing... so any suggestions what the problem could be are very welcome!
There aren't any electronics shops in my town but no use messing around: so I just bought a digital multimeter on ebay using buyitnow for a tenner including delivery.
Ah... I remember using these things at college... I've been meaning to get one for years.
I'll measure the PD across the terminals when it gets here and post. In the meantime, I'm still really puzzled by every component working fine but the whole system failing... so any suggestions what the problem could be are very welcome!
I've got the centre pin on the plug connected to the +ve (red) wire. The wire is the black-and-red insulated type (the main reason I bought that type is so it'd be easy to tell polarity)
Then on the PSU there are very clear red and black terminals for +ve and -ve. It'd stand out a mile if I'd have connected them the wring way.
As far as I can tell, the T-amp's DC-in *is* centre pin +ve. I had that pin conected towards the 12v rail of my computer PSU and it worked ok so I've be very surprised if the centre pin were -ve.
Btw, could someone point lostcause to this forum thread, since he has the same PSU working with this amp? I can't do it because I'm not an authorised user yet. His page is: http://www.diyaudio.com/forums/member.php?s=&action=getinfo&userid=50030
Then on the PSU there are very clear red and black terminals for +ve and -ve. It'd stand out a mile if I'd have connected them the wring way.
As far as I can tell, the T-amp's DC-in *is* centre pin +ve. I had that pin conected towards the 12v rail of my computer PSU and it worked ok so I've be very surprised if the centre pin were -ve.
Btw, could someone point lostcause to this forum thread, since he has the same PSU working with this amp? I can't do it because I'm not an authorised user yet. His page is: http://www.diyaudio.com/forums/member.php?s=&action=getinfo&userid=50030
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