juz_ad
Full Member level 2
I'm using the above circuit to drive 2 LEDs as shown. The input is a 10V (+/-5V) PP waveform. One LED gets an inverted and rectified input, the other LED gets a non-inverted, rectified input. One LED shows the positive-going (+V) content of the input waveform, the other LED shows the negative-going (-V) content of the waveform. All good so far.
I'm finding that as the voltage of the waveform drops below about 6-7V PP - the LEDs are almost unlit. This means that e.g. a +/-2V waveform at the input will barely illuminate either LED.
How can I get a better response from the LEDs? I don't need them brighter at +5V - but I would like them brighter at e.g. 1 to 3V.
Would a current source help with this? Can anyone suggest a suitable schematic?
Thanks in advance.