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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: My final CD-player posted by Danny T on September 3, 2003 at 02:57:01:
You might try a passive powersupply on the TDA1541's analog power pin (-18V). I'm using a 12V SLA battery, a 25 ohm rheostat, and about 1000uF of capacitance afterwards to produce an 8V supply. I reasoned that since we don't use silicon-regulated supplies for tubes anymore, due to their "electronic" sound, why on a DAC? The experiment on my 4x TDA1543 DAC has been fairly interesting. Since the TDA1541 has less current draw, you would have to use a larger voltage-dropping resistor, which might necessitate more capacitance to keep up the bass. Anyway, something to try on a rainy Sunday.Also, it seems that you can replace the 50R I/V resistor with a 50R log pot, thus producing a volume control with no extra parts in the signal path. Something I thought of that I haven't tried yet.
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Follow Ups
- try this - nl 12:45:59 09/03/03 (3)
- Re: try this - Danny T 15:26:33 09/03/03 (2)
- smaller r values - nl 17:36:47 09/03/03 (1)
- Re: smaller r values - Danny T 16:21:37 09/04/03 (0)
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