22-09-2020, 07:18 PM
This is the small audio amp I installed on the right hand side of the System 80 to the right of the Cassette player and in front of the power supply where there is a ton of room. I had to drill a small 1/4" hole in the case so the volume control pot can come through.
Since most of the TRS-80 games send the sound out via the external cassette port, unfortunately the System 80 has the main cassette built in, so no sound out the back cassette port 2 without some sort of modification. I made no modification and just picked up the sound signal thats going to the inbuilt cassette unit from Point 1 in the pic. Picked up 5v from Point 2 and earth from Point 3. A 50mm 4ohm speaker is mounted under the Video motherboard in the spot already provided for it. That spot though is designed for a 60mm speaker, so had to put in a holding strap to keep it in place.
The small 3w audio amp (uses PAM8403 chip ) with knob was bought off ebay $9.90, the speaker $10 and some wire so not an expensive upgrade.
Since most of the TRS-80 games send the sound out via the external cassette port, unfortunately the System 80 has the main cassette built in, so no sound out the back cassette port 2 without some sort of modification. I made no modification and just picked up the sound signal thats going to the inbuilt cassette unit from Point 1 in the pic. Picked up 5v from Point 2 and earth from Point 3. A 50mm 4ohm speaker is mounted under the Video motherboard in the spot already provided for it. That spot though is designed for a 60mm speaker, so had to put in a holding strap to keep it in place.
The small 3w audio amp (uses PAM8403 chip ) with knob was bought off ebay $9.90, the speaker $10 and some wire so not an expensive upgrade.
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ChickenMan
ChickenMan