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  1. Arouse1973

    Alam4vlsi

    Hello Adam
  2. Arouse1973

    bad capacitor and resistors?

    No Probs
  3. Arouse1973

    Calculating gain of an OPAMP

    You don't mention if the input is sine wave or square wave or some other wave. Op-amps are specked for sine wave inputs generally. If you are using a square wave then even a 1Hz wave with 100ns rise time will give a fast op-amp problems if the input is of a high level. Adam
  4. Arouse1973

    bad capacitor and resistors?

    Looks like RTV to me. Rubber glue used to hold component and stop them breaking of the PCB. Never see anything like that come out of components before. I would keep looking if I was you. Adam
  5. Arouse1973

    Threshold Circuit - Warning - I know practically nothing about building circuits

    Bobs right on the mark, but if your input is not rock solid then your LED could flicker on and off. Why not try a comparator with a bit of positive feedback. This gives a bit of a lazy circuit who's thresholds change when the device switches. This is a Schmitt trigger and you are applying a bit...
  6. Arouse1973

    water level indicator

    Why don't you put the buzzer across the 4th LED and resistor and get rid of the transistors? That's assuming is not a 100dB sounder that draws an amp or two :) Adam
  7. Arouse1973

    relay not working in comparator circuit

    You shouldn't really use op-amps as comparators, I know many people do. The reason is op-amps are designed to work with feedback to control their very high gain. Without this they can oscillate due to stray capacitances on the PCB. Also most op-amps apart from over the top types can't handle...
  8. Arouse1973

    Op Amp Variable Gain

    Yep, PD before the amp, like how a volume control works but of course they use log pots for audio.
  9. Arouse1973

    Dimming a 12V 24W Incandescent Bulb

    I agree with Bob, 50-50 DC would give you 50% of the current.
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