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This thread is privately moderated by Jack Crossfire, who may elect to delete unwanted replies.
Aug 20, 2016, 11:34 PM
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The DM-01 lives again

For the 1st time in 18 years, the IC pair made noise. The circuit was free from defects & did a lot better than the HTR-5230. Standby current was 160mA. They seem to need the full back panel for heat sinking. As expected, the high frequencies were gone because of the lack of a tone control. Being of much older age makes treble enhancement essential. Volume control used the ultra shmick MAX412 with 28Mhz gain bandwidth product to try to retain as much high frequency as possible.

Other than nostalgia, it's rather pointless considering a modern amplifier with 3x the power is $15. The TDA7377 does 2x30W with a lot less parts. The LA4461 does a mere 12W. Quiescent current is the same on both chips.
Last edited by Jack Crossfire; Aug 20, 2016 at 11:50 PM.
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