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Old 11th April 2012, 06:54 AM   #51
Mooly is offline Mooly  United Kingdom
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These are excellent for obtaining split supplies,

Many different voltages available,

The TLO64 is a low power version of the TL074,

There are countless opamps these days and most would just be straight swaps with no component changes needed.

The input cap (indeed all the caps) form a high pass filter in combination wioth the resistance they work into. So the smaller the cap and the "less bass" gets through.

The 2.2uf cap together with 10K and 47K is another "filter" and that then feed another 2.2uf and 47K.

If you have Java you can try this. Put 47nf and 47K in here and reduce the frequency to 1000Hz and then 100Hz and then 10Hz,
High Pass Filter - Java Experiment
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Old 11th April 2012, 01:59 PM   #52
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Location: Deux Sèvres
Thanks for the info on the Murata DC-DC converters; I hadn't come across these items in the catalogues here in France; they look like the ideal solution.

I have come across a couple of TL064s in my IC collection that I can use to replace the (two) 5532s. I have found a SSM2404 that's a quad SPST analogue switch; it can be used to replace the (two) dual switches in the existing design.

Yes, thank you, I've been able to run the figures through the high pass filter circuit and I can see what you're describing about losing the lower frequencies with the small value cap. It appears that a value of 2,2uF would be adequate to retain the bass. I'll make all the changes and see what happens.

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