Harlequin 48 Max Issue 2

A place to discuss the ZX80's and ZX81's younger brother - the Sinclair ZX Spectrum
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rune
Posts: 164
Joined: Thu Sep 04, 2014 8:35 am

Harlequin 48 Max Issue 2

Post by rune » Sun Mar 31, 2019 3:45 pm

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

McKlaud
Posts: 242
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: Harlequin 48 Max Issue 2

Post by McKlaud » Sun Mar 31, 2019 4:08 pm

Please have a look on the attached schematic.

I would also suggest using 74HCU04 inverter instead of 74HC04.
Attachments
ZXMax_i2_C24.png
Claudius
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rune
Posts: 164
Joined: Thu Sep 04, 2014 8:35 am

Re: Harlequin 48 Max Issue 2

Post by rune » Sun Mar 31, 2019 5:33 pm

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

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