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Old 15th October 2013, 08:18 AM   #81
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EC designs likes to connect the output to the source of the current, being Vdd.

This is also easily achieved
  • by connecting the output I/V resistor to Vdd, and because it supplies 1,2 mA the value can be calculated to e.g. 3k3 @ 7V. The output will be too high then, full scale current being 2,3 mA.
  • Or 2K @ 5V which might just give almost 5Vpp.
Some enhancements can be thought of in this case

In the drawer, not the bottom one.
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Old 26th December 2013, 07:36 AM   #82
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Triode_al,

In your interesting post 69 the schematic mentions LC272 as opamp.
May I assume any opamp will do that is capable of asymmetric power supply?
Or even an opamp in symmetrical power supply if available?
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Old 29th December 2013, 08:18 AM   #83
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Quote:
Originally Posted by av-trouvaille View Post
Triode_al,

In your interesting post 69 the schematic mentions LC272 as opamp.
May I assume any opamp will do that is capable of asymmetric power supply?
Or even an opamp in symmetrical power supply if available?
Sorry, I have not tested other asymmetrical power supply- opamps, as I found this opamp in a dump (kwakkelstein) so it was a real trouvaille for me
And I did not have an asymmetrical power supply in my build.

The goal is to be able to have a real step, and then apply a little bit of filtering.
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Old 29th December 2013, 09:22 AM   #84
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Thanks. I will have a try with other opamps.

OT: What a coincidence you mention Kwakkelstein, as my diyaudio name was inspired indeed from the period many years ago I frequented him and gathered lots of trouvailles. I wonder whether the warehouse he retreated in is still open these days.
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