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Chip Amps Amplifiers based on integrated circuits

DS1802 with LM3875
DS1802 with LM3875
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Old 25th February 2005, 07:24 PM   #11
josiphal is offline josiphal  Croatia
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Join Date: Jun 2003
Location: Croatia
Originally posted by Fixup

The 5V limit seems a huge problem of this great IC, because line level can go over 5V. In practise, however, it'll work at 7.5V, high enough to avoid input clipping with line level.
7.5V is maybe too high. Absolute max voltage on any pin is 7V. Even at 5.5V (+/-2.75V), recommended DC max, DS1802 works fine (2.3V RMS input voltage).

In my preamp it works on 6V (+/-3V) without any clipping problem with standard CD/DVD component line out.

Originally posted by soundNERD

One final question about these chips. Is there a way for it to retain the volume setting in memory or something when I turn it off, or am I stuck leaving it on all the time if I want to keep the volume where I left it?
At power up, volume is min, not mute. Problem?

Originally posted by Fixup

The easiest way to keep the volume position is to keep its power supply. As it drains very little current, this is not a problem even with batteries. This is the way I use in my portable amps. Otherwise you'll need a microcontroller, then all the beauty of this button controllable IC is gone.
Don't be so sure! It works with microcontroller nice, too.
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Old 26th February 2005, 08:10 AM   #12
Fixup is offline Fixup  United States
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Join Date: Feb 2005
Location: N. Calif.
Yes I know it works with a microcontroller, but the true beauty of this IC is that you don't have to use a uC.
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