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  1. Alec_t

    Multi-input D flip-flop?

    How about one of these ?
  2. Alec_t

    Mains filter/conditioner schematic.

    Yes, but it will weigh a ton! Tot up all the Watts demanded by your equipment at full blast to see what sort of power the tranny would have to handle.
  3. Alec_t

    question about ALPS potentiometer.

    Providing your amp doesn't mind seeing an apparent 50k pot (100k in parallel with 100k) you should be ok.
  4. Alec_t

    Shut off timer

    How long a time delay are we talking about?
  5. Alec_t

    Mains filter/conditioner schematic.

    It's a possibility. But 'dirty' mains implies frequencies higher than 50/60Hz. What hum frequencies did you experience? Another possibility is a defective screen (e.g. an intermittent break or loose connection) on a mike/guitar cable, allowing mains hum pickup.
  6. Alec_t

    How to not kill my electronics with voltage spikes

    A suitably-rated bi-directional Transient Voltage Suppressor (TVS) across the motor might help.
  7. Alec_t

    Lithium ion polymer battery: What is the 3rd (yellow) lead? what can I use for a replacement?

    The battery should have protection circuitry to disconnect it if it gets discharged too far. Looks like it has activated in your case.
  8. Alec_t

    Building Eight Port 5V 2A Power Distribution System

    Welcome to EP! This thread may answer some of your questions.
  9. Alec_t

    Add a resistor to invert a sine wave??

    The current through R2 and R3 is the same, but they are on opposite sides of the ground point.
  10. Alec_t

    Mains filter/conditioner schematic.

    No. You can't hear RF frequencies. Hum is usually at mains frequency (or a harmonic).
  11. Alec_t

    Pot Core dismantling

    Only a room full? I have two rooms plus a garage full of stuff that 'will come in useful one day' :p
  12. Alec_t

    Mains filter/conditioner schematic.

    If the hum is more noticeable in some venues than others then it could be due to inadequate earthing of the mains installations. A filter to suppress 50/60Hz would need to be very narrow band or else wanted bass frequencies would be affected too. It would help to locate the source of the hum...
  13. Alec_t

    Flash Drives

    I don't know which is best. I daresay each manufacturer has their own preferred algorithm.
  14. Alec_t

    Flash Drives

    Because of the limited number of write cycles possible with flash memory you will need to find a 'wear levelling' method, as is used in commercial flash drives.
  15. Alec_t

    buck/boost converter problem..advise appriciated

    I doubt it. The spec says they're non-isolated, which presumably means the output and input share a common ground.
  16. Alec_t

    buck/boost converter problem..advise appriciated

    You've sussed it. Your monitor needs more current than the converter can provide. You need a higher power rated converter. Correct. You can't get more power out than the rated value without cooking something. Power(W) = current(I) x volts(V), There's a well-known saying: "the transistor is...
  17. Alec_t

    buck/boost converter problem..advise appriciated

    Welcome to EP! Converter :- Monitor :- Do you see the problem there?
  18. Alec_t

    Need help delaying a voltage feed for about 150ms to 300ms.

    Maybe I haven't understood exactly what you're trying to do, but I think you'll have problems trying to use just one pin for the cap function and the voltage divider. From what I've read ADCs don't generally like source impedances greater than ~ 10k, and 10k with a 1uF cap has a time constant of...
  19. Alec_t

    Need help delaying a voltage feed for about 150ms to 300ms.

    According to the datasheet "RST remains low while VCC is below the reset threshold and remains low for 150 ms typical after VCC rises above the reset threshold. Applies to the ADM1810, .... and ADM1818 only." After that 150mS the output will be pulled high to Vcc by the internal 5.5k pull-up...
  20. Alec_t

    Modifying pre made delay timer module

    Can't you just swap the NO/NC connection?
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