4
edits
ZX Spectrum 16K/48K: Difference between revisions
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Add speaker impedance details
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=== Issue 3 === | === Issue 3 === | ||
The Issue 3 Spectrum included a new, uprated speaker with louder output. This is buffered by a new transistor on the PCB (TR7, ZTX450) instead of being directly driven by the ULA. | The Issue 3 Spectrum included a new, uprated speaker with louder output (Speaker impediance is now 40 ohms instead of 200 ohms for Issue 1/2 boards. This is buffered by a new transistor on the PCB (TR7, ZTX450) instead of being directly driven by the ULA. | ||
Starting with the Issue 3, a low power 6C ULA was used, with changes to the handling of the EAR socket which caused compatibility problems. The "spider" fix was integrated into board. | Starting with the Issue 3, a low power 6C ULA was used, with changes to the handling of the EAR socket which caused compatibility problems. The "spider" fix was integrated into board. | ||