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Another Camputers Lynx project

Blogs & guides and tales of woo by forum members.
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PhilC
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Re: Another Camputers Lynx project

Post 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.
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If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: Another Camputers Lynx project

Post 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!
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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peters
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Re: Another Camputers Lynx project

Post by peters »

I do remember the PSU got rather hot and there are no vent holes.
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PhilC
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Re: Another Camputers Lynx project

Post 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
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rubber_jonnie
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Re: Another Camputers Lynx project

Post by rubber_jonnie »

I presume rectification is done by 4 diodes rather than a single bridge rectifier?
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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PhilC
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Re: Another Camputers Lynx project

Post 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.
If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: Another Camputers Lynx project

Post 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%.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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