Робик (Robik): Part 4 - Final Mods

Channel:

The Clueless Engineer

Subscribers:

3,300

Published on October 29, 2022 4:25:16 AM ● Video Link: https://www.youtube.com/watch?v=kELkfYw1vbs

Duration: 21:47

182 views

17

Final list of mods I've made to this neat little Ukrainian ZX Spectrum clone - almost halved power consumption:

[1] Replaced the attached PSU with a 2.1mm socket
[2] Replaced the КРЕН5А (KREN5A = Soviet 7805 linear regulator) with a switching regulator
[3] Heat sinks on the hot running chips (programmable logic matrices, ROMs, Z80)
[4] New RGBS+audio and cassette-in DIN cables

I didn't end up changing the red power LED ... this time.

Replacing the regulator dropped the current draw from 1.11A to 0.62A, as well as removing a large source of heat inside the machine.

Switching regulator (PSU3):
www.ezsbc.com

Heat sinks:
Fischer Elektronik parts ICK 24 B and ICK 40 B

Non-conductive heat sink plaster:
Search for "st922" on Aliexpress
https://www.aliexpress.com/wholesale?SearchText=st922

2.1mm DC panel socket:
Lumberg part 1610 01