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6 votes

Issue with solenoid valve sparks despite using two 1N4001 flyback diodes

simulate this circuit – Schematic created using CircuitLab The diode should be connected across the solenoid, not the power supply. In the photo supplied you seem to be touching the solenoid ...
Transistor's user avatar
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5 votes
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Issue with solenoid valve sparks despite using two 1N4001 flyback diodes

The photograph and the pictorial do not tally. The photograph shows the flyback diode wrongly wired across the power supply terminals. The corresponding schematic is as follows. On the other hand the ...
vu2nan's user avatar
  • 18k
2 votes
Accepted

Use voltage of canbus wire to control relay

To detect the presence of data on a CAN bus without compromising the data on the bus, you are going to need a circuit that has a high input impedance and can detect AC (data changing on the bus - 1's ...
MOSFET's user avatar
  • 2,095
2 votes
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PCB layout for inductors

Distance affects the coupling coefficient between inductors. Most generally, one can consider all inductors coupled, that coupling given by a matrix of coupling factors, from each one to every other. ...
Tim Williams's user avatar
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2 votes
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Need help with AC relay wiring

simulate this circuit – Schematic created using CircuitLab Figure 1. As specified. simulate this circuit Figure 2. A more typical wiring solution.
Transistor's user avatar
  • 175k
2 votes

Need help with AC relay wiring

According to the drawing you show, terminals 5 and 6 are the common contacts, where you would connect the power input. Terminals 1 and 2 are the Normally Closed contacts, and 3 and 4 are the Normally ...
Peter Bennett's user avatar
1 vote

Electromechanical relay snubber

The relay coil is nominally 800Ω so the 1Ω resistor is doing virtually nothing. You should have a diode or a diode + zener diode or diode + resistor across the coil, otherwise when the phototransistor ...
Spehro Pefhany's user avatar

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