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Re: Another Camputers Lynx project
Posted: 05 Apr 2026 15:58
by PhilC
I decided whilst I've got the Lynx on the desk to check the power supply.
After drilling out 7 rivets, 4 for the case, 3 connecting the three voltage regulators to the case, that I'd give it a test and see how the capacitors are holding up.
It actually looks to be in great condition internally, so I'll test the caps and replace them if needed, then tap out the holes left by the rivets and fit bolts instead.
For those who are interested (if anyone :lol: ) regulation is done by three LM3402s, 12v,5v and -5v
PXL_20260405_145242080.jpg
PXL_20260405_145124769.jpg
PXL_20260405_145141017.jpg
Edit: And the good news is the caps all checked out just fine. I've now put it all back together. Tapped the case screws out to M4 and fitted nuts and screws to the three voltage regulators.
All back together and now running fine once again.
Re: Another Camputers Lynx project
Posted: 05 Apr 2026 17:21
by rubber_jonnie
PhilC wrote: 05 Apr 2026 15:58
I decided whilst I've got the Lynx on the desk to check the power supply.
After drilling out 7 rivets, 4 for the case, 3 connecting the three voltage regulators to the case, that I'd give it a test and see how the capacitors are holding up.
It actually looks to be in great condition internally, so I'll test the caps and replace them if needed, then tap out the holes left by the rivets and fit bolts instead.
For those who are interested (if anyone :lol: ) regulation is done by three LM3402s, 12v,5v and -5v
PXL_20260405_145242080.jpg
PXL_20260405_145124769.jpg
PXL_20260405_145141017.jpg
Edit: And the good news is the caps all checked out just fine. I've now put it all back together. Tapped the case screws out to M4 and fitted nuts and screws to the three voltage regulators.
All back together and now running fine once again.
That's a chonky boy!
Re: Another Camputers Lynx project
Posted: 06 Apr 2026 10:30
by peters
I do remember the PSU got rather hot and there are no vent holes.
Re: Another Camputers Lynx project
Posted: 06 Apr 2026 11:40
by PhilC
peters wrote: 06 Apr 2026 10:30
I do remember the PSU got rather hot and there are no vent holes.
Yeah I'm not surprised with those three voltage regulators using the case as their heatsinks
Re: Another Camputers Lynx project
Posted: 06 Apr 2026 12:41
by rubber_jonnie
I presume rectification is done by 4 diodes rather than a single bridge rectifier?
Re: Another Camputers Lynx project
Posted: 06 Apr 2026 15:07
by PhilC
rubber_jonnie wrote: 06 Apr 2026 12:41
I presume rectification is done by 4 diodes rather than a single bridge rectifier?
It looks that way. I didn't really look, was too busy drilling and tapping.
Re: Another Camputers Lynx project
Posted: 06 Apr 2026 15:11
by rubber_jonnie
PhilC wrote: 06 Apr 2026 15:07
rubber_jonnie wrote: 06 Apr 2026 12:41
I presume rectification is done by 4 diodes rather than a single bridge rectifier?
It looks that way. I didn't really look, was too busy drilling and tapping.
Stupid rivets...
I think possibly my TRS-80 Model 1 PSU had rivets as well, though I can't recall 100%.