Heat question for SN74LS641-1

[timmcross]

Info

• Which version of Pi are you using: 3B+
• Which github revision of software: master
• Which board version: 2.4a
• Which computer is the RaSCSI connected to: p4 1.5GHz, Adaptec 2940, WinXP

Describe the issue

First off, great project! Built the board from the ground up and worked the first time!

One thing I noticed was that the SN74LS641-1 chips get quite hot during operation. Is this expected? Would small heatsinks be recommended?

Thanks, Tim

[rdmark]

@timmcross The transceivers do run hot! They're rated for 70C, and anecdotally they run fine naked. If you have room for them, heatsinks probably won't hurt though!

See this post for more details: https://68kmla.org/bb/index.php?threads/rascsi-development-thread.6868/post-426873

[Pacjunk]

Here's mine. I use "RAM chip heatsinks". They still get quite hot, but anything is better than nothing. Haven't had any problems running for several hours.

.

[hsiboy]

Yeah, mine run hot and sing! Depending on what Rascsi is doing, i can hear a faint whine coming from them.

[rdmark]

Added an FAQ entry for this. Closing out this ticket! https://github.com/akuker/RASCSI/wiki/FAQ