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Harlequin 48 Max Issue 2

Posted: Sun Mar 31, 2019 3:45 pm
by rune
Hi, has anyone built the Harlequin ZX 48 Max issue 2?

There is a capacitor marked on the board but not in the BOM. Its position C24

I'd appreciate if anyone could tell me the value to use.

Dave

Re: Harlequin 48 Max Issue 2

Posted: Sun Mar 31, 2019 4:08 pm
by McKlaud
Please have a look on the attached schematic.

I would also suggest using 74HCU04 inverter instead of 74HC04.

Re: Harlequin 48 Max Issue 2

Posted: Sun Mar 31, 2019 5:33 pm
by rune
Thanks McKlaud

47pF it is then...

I'll try the alternative inverter if there are problems. Got a bit to wait for 4.43Mhz crystals arriving.

Dave