Confused about wiring up this device. Refer to attached SKETCH (jpg)
Seeking help to turn ON 5 volt sound card then turn it OFF via RC pulse signal.
Hi Geoffrey
That little diagram with the white background is completely self explanatory. I haven’t looked at the data sheet for this switch but it looks like the logic supply and load supply are separate. You haven’t connected any load supply at all. Your connections are completely wrong Just follow the diagram. You have got the red and black load connections reversed anyway. If I were drawing you a connection diagram that little circuit is what I would draw so no good repeating it.
Cheers Bob
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The RC receiver is going to feed a PWM signal to the MOSFET switch. This might be +5V DC but is more likely to be high frequency AC. If you are having trouble getting the circuit to work the place to start is to confirm that your RC receiver is responding to the transmitter with either 100% or 0% duty cycle - if it’s not going full scale then the switch will see an AC signal and won’t switch properly. I would recommend a voltage integrator between the RC receiver and the switch, so that anything over ~80% is on and anything under ~20% is off.
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The only way a PWM signal should be AC is if it is via a capacitor.
I would still get the basic DC wiring correct before you fry something if this is not already happened.
For instance connecting the load supply up is not going to do any good if the load connections are reversed. At switch on Bye Bye audio board.
Cheers Bob
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PWM is a signal that alternates between positive voltage and zero with a varying duty cycle. If the duty cycle is 100% or 0% then it is DC: for any other value it is AC. It is common that a RC receiver will not swing completely to either 100% or 0%, but that circuit requires either 0 or +ve to be steady for enough time for the switch to respond. OP needs to confirm that the transmitter/receiver combination is providing a PWM of either 100% or 0%, or there needs to be an integrating circuit (which might be as simple as a capacitor) to remove the pulses from the signal and provide a clean signal level for that switch.
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Jeff.
Afraid I can’t agree with that. AC is A=Alternating ie; alternating between pos and neg, C=Current thus AC implies voltage and current flow change or “alternate” between pos and neg.
This bit says it all. The signal never goes negative so cannot be defined as AC. By going to a lot of trouble with dual (+/-) supplies I suppose it could be made to swing negative but I have never seen or heard of that being done or heard of any use for that scenario.
Inserting a capacitor in series to remove the DC component might work if you really wanted AC but full on (100%) or full off (0%) would both be 0V after the cap charged and discharged.
But Ahhhhhhh, the world would be very uninteresting if every one always agreed.
Cheers Bob
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