Line Level Stereo Output on Genesis 1

Description: A modification is being planned for a Genesis console to enable S-Video and RCA jack outputs. Current modifications typically utilize the headphone jack as the source for stereo sound. However, there is a preference to bypass the volume control slider. The inquiry seeks to determine if it is feasible to tap the audio signals before they reach the amplifier and redirect them to a custom fixed-gain amplifier. Assistance and advice on this matter would be appreciated.

To achieve the desired S-Video and RCA jack modification on the Genesis console, it is essential to understand the audio signal path and the potential for tapping into it before amplification. The Genesis typically routes audio signals through a built-in amplifier, which is controlled by the volume slider. By modifying the console to bypass this control, a fixed-gain amplifier can be utilized to maintain a consistent audio output level.

The modification process involves locating the audio output traces on the Genesis motherboard. These traces can be identified by consulting the schematic diagram of the console, which details the path from the audio output chip to the amplifier. Once identified, it is possible to cut the traces leading to the amplifier and solder new connections to capture the audio signals before they are amplified.

For the S-Video output, the modification requires separating the chrominance and luminance signals from the composite video signal. This can be accomplished by using appropriate filtering and buffering circuits to ensure signal integrity. The S-Video output can be routed to a dedicated S-Video connector while simultaneously providing the RCA output for audio.

It is recommended to use a high-quality fixed-gain amplifier to ensure optimal audio performance. The amplifier should be chosen based on the desired output level and impedance matching with the downstream audio equipment. Additionally, attention should be given to the grounding and shielding of the new audio outputs to minimize noise and interference.

Overall, this modification requires careful planning and execution to ensure that the integrity of the audio and video signals is maintained while achieving the desired functionality. Proper tools and components should be used to facilitate a successful modification, and thorough testing should be conducted to verify the performance of the new outputs.I am planning on doing an s-video and rca jack mod on my Genesis. The mods I see done seem to all use the headphone jack as the source of the stereo sound. Is this the only way? I would prefer to have the output not be controlled by the volume slider. Is it possible to tap the signals before they go to the amp and route them to my own (fixed-gain) amp? Any help/advice is much appreciated..