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Old 19th May 2004, 06:15 AM   #1
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Default Help - Preamp with LM1036

I've noticed this nice little chip (LM1036) from NS, it seems it would be perfectly suited to my gainclone. But what I don't understand from there schematic in the PDF, is what/where the POT's go to control the Bass/Treble/Balance etc. Could anyone possibly point this out to me?
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Old 19th May 2004, 06:42 AM   #2
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The LM1036 is "DC controlled", so the DC level at the control pins sets the effectiveness of volume, balance, etc.

quoting from National website:
Quote:
Four control inputs provide control of the bass, treble, balance and volume functions through application of DC voltages from a remote control system or, alternatively, from four potentiometers which may be biased from a zener regulated supply provided on the circuit.
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Andrea
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Old 20th May 2004, 04:23 AM   #3
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OK. So what would be the ideal way to use this as a preamp for my gainclone? I'm new to all this sort of electronics stuff, but I'd like to learn.
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Old 24th May 2004, 06:28 AM   #4
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You can simply use the LM1036 per the suggested schematic shown in the datasheet. This IC allows a fully functional Tone, Volume and Balance preamp to be easily made.

The reference schematic works and you can use a switch for the loudness function (more tone boost at lower volumes). I recommend operating it at 12-15V. As the supply is single ended, you must use input/output caps per the schematic. The chip tends to get warm as it dissipates >300mW during normal operation.

Note that the LM1036 cannot handle high level inputs (e.g CD player outputs at 1Vrms). It works best with 100-300mV input. So add resistors/op-amp buffers where necessary depending on your application.

I used the LM1036 for a simple computer amplifier before so I cannot comment on its sound quality, only that it works as advertised.

Good luck.
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