[sdiy] ASM LFO - any experiences?

[Scott Bernardi]

Remember LED's need quite a lot of current to light up properly - they 
would load down an opamp.
Here's a circuit that uses a differential pair built of a couple 
transistors to drive the two color LED
http://home.comcast.net/~sbernardi/elec/og2/og2_lfo.html

Paul Perry wrote:

>>Also, I'd like to add an LFO indicator that would increase brightness
>>on both the positive and negeative swing. Could I used a bridge
>>rectifer or is there an easier way? 
>>    
>>
>
>An amusing approach might be to use one of those two-color leds that 
>are red or green depending on which way the current flows.
>You could just have a buffer and a resistor to the diode & the other 
>end of the diode to ground.
>Then when the lfo is + it glows red on the peak & green on the -ve.
>paul perry Melbourne Australia
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