I want use Electret microphone Pre-amplifier described in TI document, with Color light organ. Will the output level of this pre-amp enough to drive LM324 Op-Amps on Color organ? Input signal goes to VR1 "Master level" potentiometer. Also, is the standard Line level output of consumer audio electronics enough for connecting it to VR1?

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  • \$\begingroup\$ Rerun your simulation with a 1.6k resistor in parallel with your 100k resistor. 4 10k pots in parallel are the equivalent of 2.5 k. With these tied to the wiper of VR1 (5k) the worst case input load is 1.67k. \$\endgroup\$ – WhatRoughBeast Dec 20 '16 at 0:50
  • \$\begingroup\$ I want modify pre-amp for 12V, so I calculated R1 and C3 values based on formulas (9) and (11) respectively, and got R1 = 21kΩ and C3 = 1.51uF. Is that correct? What will be the output voltage of the op-amp with 12V power supply? \$\endgroup\$ – minto Dec 21 '16 at 23:12

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