Re: Can't find info about addon card for HP-150 #VintageHPComputers
On 5/31/21 2:00 PM, Sonno Ocea wrote:
I dismantled my HP-150 to check if there was anything wrong and while IWow, that's an interface board for HP's "PC Instruments" series of
low-end test equipment. That's a fairly unusual board.
Also, all the light blue capacitor (22uF 25V) on the VIDEO and SERIALReplace it with an electrolytic capacitor. Sure, it may leak again,
but in 30-40 years.
The danger of replacing electrolytic capacitors with MLCCs is that the
latter tend to have issues with voltage coefficient of capacitance, i.e.
the capacitance goes down as the voltage across the capacitor increases.
You can lose as much as 50%, sometimes more, of your capacitance that
way...bad choice for a capacitor across a DC rail.
Dave McGuire, AK4HZ
New Kensington, PA