MITS 4K SRAM "bypass resistor" question
- I noticed that 3 of my ram cards have 4ohm 5w bypass resistors over the voltage regulators and 1 doesn't. It doesn't appear that the bypass resistor ever was installed since I don't see any "solder" tinning on the tabs. Now this card did start out as a 2k card, so it would have sourced less current.Should I install one or is my non-upgraded early altair supply dropping down enough in voltage with 8 full slots to keep the 7805 sourcing what is needed on the card without thermal shutdown. I've never had a problem with the card, I'm just worried if it will be.Thanks,Corey
- The other factor that affects this question is how fully loaded is your Altair? With a very lightly-loaded Altair, the input voltages to these regulators is higher, and the regulators will get hotter.
If it were mine, I would not add the resistor. The card will work fine without it - maybe the regulator will get a little warmer with extended use.
The 7805 regulator has a thermal shutdown circuit, so even if it gets too hot, it will just go into shutdown, without damage. :-)