Re: 'Frankenstein' Disk Drives, Done Cheap

From: Ingo Korb <>
Date: Wed, 23 Apr 2014 20:33:37 +0200
Message-ID: <>
Julian Perry <> writes:

> 1: it has no RF modulator, only an Svideo output. Since the RF
> modulator is responsible for the chroma signal bleed into the
> luminance signal, it would be interesting to see what the video output
> quality is like - and whether the circuit can be easily adapted to
> existing boards. 

That part is (as far as I know) derived from the modulator replacement
circuit that some people developed a few years ago on The
full (reconstructed) thread about is is here:

The schematic in post number 15 is the basic version that just creates
standard Y/C signals from the VIC2's output. Unfortunately I don't see a
(good) schematic version that includes the AEC stripe fix, but that is
basically just a single inverter from a 74HCT14, a 2k2 trimmer pot from
its output to the ground and a small capacitor (47pF or so) from the
wiper to the base of the luma transistor.


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Received on 2014-04-23 19:00:03

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