Great device designed by Sven Petersen.
Composite out. Mono or Stereo out (If your 64 has been modded with). Audio In.. SVideo out!
This device makes hooking up your 64 to a modern tv quick and simple.
The A/V-Adaptor allows to connect standard S-Video and Audio or Composite-Video cables to the A/V-Jack of the Commodore C64.
A 330 resistor to attenuate the Chroma signal for S-Video is installed, but it can be deactivated by setting a jumper (JP2). This attenuation is required, since the chroma signal has a level, which is too high for standard S-Video.
Further, the audio input can be connected to GND, in case it is not in use to reduce the noise introduction.
The two audio output jacks can be connected by a jumper. Alternatively, the stereo sound output (A/V-Jack, pin 7, in case a 2nd SID is installed inside the C64) can be connected to the right channel of the audio output. The first SID output is connected to the left channel of the audio output.
The A/V-Plug for the C64 is the inner part of a Lumberg 033099 SV 80 DIN-Plug (8 pins, horse shoe = 262°). It provides a round plastic shell of the DIN-connector and long enough pins, so the adaptor can sit firmly in the A/V jack. The inner part of a cheaper (standard) connector cannot be used, since it does not sit firm enough.
3 Audio Out (mono/left)
4 Composite Video
5 Audio In
7 Audio Out (right – if provided)
A vertical PCB mount Mini-DIN jack (4 circuits)
1 GND (Luminance)
2 GND (Chrominance)
Audio Out (mono/left)
Audio Out (mono/right)
The chrominance signal has a too high level for the standard S-Video chroma signal. The jumper bridges the 330 resistor (R1) to switch off this attenuation.
open Attenuation active
set Attenuation inactive/off
To reduce the noise introduction to the Audio Input, this can be grounded.
ON SID Audio In connected to
OFF SID Audio In connected to GND
The standard audio output of the SID is one channel (mono). In cases a 2nd SID is installed, the 2nd audio output is (usually) connected to Pin 7 of the Audio/Video jack of the C64. JP3 connected the right channel of the audio output (J4) to either J2, Pin 3 or Pin 7.
MONO J4 connected to J2, Pin 3
STEREO J4 connected to J2, Pin 7
check out a short video here: