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  1. Alec_t

    Push-Pull Potentiometer Selection for Specific Electric Guitar Effects

    It looks as though both push-pull pots have DPDT switches, but one pole of the switch on the pot without the capacitor is unused (so effectively it is a SPDT switch).
  2. Alec_t

    Push-Pull Potentiometer Selection for Specific Electric Guitar Effects

    'Pot ' is short for 'potentiometer, whereas 'SPST' etc are types of switches. Are you referring to plain switches, or to potentiometers incorporating switches?
  3. Alec_t

    Pulsate 1.5v D cell battery

    If you cannibalise a cheap garden light you will probably find it has a YX8018 IC which is used to boost 1.2V to ~3V to operate the LED. That could be used to boost the 1.5V cell voltage to something which could power a 555 timer IC and visible-light LED.
  4. Alec_t

    What optical mouse product works on a smooth surface?

    Provided the smooth surface has a sufficiently fine pattern on it most optical mice should work. Such mice don't like plain surfaces though.
  5. Alec_t

    A recommended free online schematic creator ????

    I've attached a connector symbol .asy file for you (rename it by deleting the .txt extension) I created it by :- 1) drawing a schematic with just ten labelled nodes 1-10 (as per the connector.asc attachment), 2) using the Hierarchy tool to let LTS create its own symbol (as per the con1 image)...
  6. Alec_t

    Transformerless audio amplifier

    Yes, but extremely dangerous, as anything connected to it will be at mains potential.
  7. Alec_t

    how to identify max forward current in an infrared LED with no spec sheet

    Welcome to EP! If you can't identify the LED type I think experimenting to see the maximum current before a sacrificial LED fails is the best way. Then run the LEDs at, say, 50% of the maximum. Alternatively, you could assume the power handling ability would be similar to that of a known spec...
  8. Alec_t

    A recommended free online schematic creator ????

    I've just remembered it's actually simpler just to fire up LTS and click File/New symbol to open a blank canvas for a custom symbol.
  9. Alec_t

    A recommended free online schematic creator ????

    You can easily make your own in LTS. Copy any .asy file and double-click the copy to open it in the LTS editor. Then edit away using the Draw/Delete/Move tools.and save the edited version in the appropriate sym folder under a new name.
  10. Alec_t

    Recliner Auto-Return Function

    Welcome to EP! Probably, but you would need the wiring diagram for the motors and controls to see how to interface the new control with the old ones. Can you post the wiring diagram?
  11. Alec_t

    Solar garden lamp repair

    In the garden light I tore down the 'charging circuit' was very simple, so not much to fail except for corroded connections :-
  12. Alec_t

    Smoke machine using resistance wire

    If P1 is 4.43V when the wire is in circuit between P1 and P2 then it must be heating up when presumably it is not meant to be. That suggests a possible faulty MOSFET. If the old wire was 1.2Ω and the new one is 2.6Ω, perhaps the micro senses that at power-up and interprets the higher resistance...
  13. Alec_t

    Is this a transformer???

    Welcome to EP! The image is too blurred and too small for accurate identification..
  14. Alec_t

    Electric circuit problem

    We don't know where nodes 3 and 6 are. I suggest you get into the habit of applying labels to nodes you are interested in, so that it is easier for us to discuss the circuit operation. I ran a sim of your circuit and it shows Vce=20mV when a transitor is on.
  15. Alec_t

    Electric circuit problem

    If Q1 is on then Q2 is off. You are using LTspice's default transistors, so you can assume Vce =0 when a transistor is on. What does LTS show it as? Eq1,2, 3 and 4 are missing the factor 1000 for resistance. Eq3 looks wrong.
  16. Alec_t

    What's bridge purpose in connecting the two functional circuit

    Ahh. You're right.
  17. Alec_t

    What's bridge purpose in connecting the two functional circuit

    It provides AC feedback.
  18. Alec_t

    Charge a 7.4 Li-ion battery through micro USB port

    Welcome to EP! No. USB is 5V; not high enough for charging a 7.4V lithium battery. That's a 2S battery which should be charged with a dedicated 2S balanced charger for safety. Such a charger will need a supply of at least 8.4V, typically 9V, able to handle the required charging current.
  19. Alec_t

    Getting voltages from transformer

    How about this?
  20. Alec_t

    Switched Mode Power Supply problem

    Welcome to EP! That switch-on/shut-down/switch-on/shut-down.... behaviour is typical for a SMPS which is over-loaded and is trying to protect itself. It may be that the Chauvet head has a fault (e.g. a failed/stuck motor) and is drawing excessive current.
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