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  1. Arouse1973

    Peak detector circuit.

    Ok I didn't realise you had been given some specifications already. As you already know the first part of the circuit is the peak detector and has a gain of 2. The output will rise up until the inputs are of the same value. The reason the feedback path is taken from the other side of the diode...
  2. Arouse1973

    H2O Auto-Fill Schematic Sanity Check

    Hi Fish. I could have said what a load of shite, this won't work. But that doesn't help anyone, this is why I prefer to say something like, can you explain how your circuit works. This is really urging them to have another look and follow it through. We all make mistakes I have been doing this...
  3. Arouse1973

    PWM to 0-10v

    The op-amp is not classed as a logic component :). What have you done yourself about this problem. Let's see some effort from you first, show us a circuit that you think might work. Look at your input range and output range, this should give you a clue. Adam
  4. Arouse1973

    Switching between charge and load of lipo batteries in series.

    Yes as I said solid state might be the only option. Adam
  5. Arouse1973

    H2O Auto-Fill Schematic Sanity Check

    That looks better, I thought there was something odd about your first circuit. So now you have latched the relay so even if it gets light after the dark switch has triggered. It won't stop filling until the water level breaks the full switch. Adam
  6. Arouse1973

    Switching between charge and load of lipo batteries in series.

    I have looked and I can't find a suitable switch. The only other option is to use relays but I don't know of any that can float. Solid state switches might be the only option. Thanks Adam
  7. Arouse1973

    Peak detector circuit.

    Hello Heevy, welcome to EP. Are you sure the waveform is a sine wave? And is the frequency 10.8 KHz? Something's not right with the values. Also the values for the feedback R22 and R23 I would expect to be much larger, they are going to discharge the capacitor very quickly. Also adding the low...
  8. Arouse1973

    Switching between charge and load of lipo batteries in series.

    Like this? Sorry it's on it's side, it was too small the other way.
  9. Arouse1973

    Switching between charge and load of lipo batteries in series.

    Or this?
  10. Arouse1973

    Switching between charge and load of lipo batteries in series.

    Like this?
  11. Arouse1973

    H2O Auto-Fill Schematic Sanity Check

    I have re-drawn the circuit so my pea sized brain can try and understand it. Does this look correct Fish? Adam
  12. Arouse1973

    H2O Auto-Fill Schematic Sanity Check

    Hi Fish, yeah I got the principle from your first post. I was after an explanation on how the circuit worked. Cheers Adam
  13. Arouse1973

    Switching between charge and load of lipo batteries in series.

    Ah you want to automatically switch between charging of the different cells. And you want to switch a different pair in as the previous pair have discharged? Is that correct?? Adam
  14. Arouse1973

    H2O Auto-Fill Schematic Sanity Check

    Hi Fish I personally would have a threshold detector of some kind for the light sensor so the output switches fast and clean. You will find because it gets dark over quite a long period of time that the transistor will spend an amount of time in it's linear region and thus start to heat up. I...
  15. Arouse1973

    Switching between charge and load of lipo batteries in series.

    Hi Kenneth First thought is a RF or IR transmitter, but what range would you require? You will also need to consider what you will be powering this electronic switch from. Thanks Adam
  16. Arouse1973

    Need a 555 cct that can only be triggered once during its countdown time

    Thank you!
  17. Arouse1973

    Trying to understand a low voltage warning circuit

    You seemed confused earlier when you said "That would mean the resistance is dependent on the current. But how does that work?" I answered that for you and now your saying, you didn't need to know that! So I guess just stick with the zener hogs most of the current, it's good enough. Adam
  18. Arouse1973

    Need a 555 cct that can only be triggered once during its countdown time

    Please explain how they work. Adam
  19. Arouse1973

    Need a 555 cct that can only be triggered once during its countdown time

    Neat circuit Colin, but Dave wanted to use a 555 timer. Also I think your circuit will require a small delay so the bell is on for long enough initially. Adam
  20. Arouse1973

    Using pnp and npn transistor as 1 pole 2 throws switch

    That's a good idea Colin. You may have to change the resistor value to change the brightness of the LED because this circuit will draw a few mAs less than the original design. But it may not be an issue. Adam
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