Hi folks. On the attached schematic, there's a diode on the coil of the relay, to protect the system from the coil spike when the relay opens.
Does it matter which way the 1N4004 diode is "pointing"? i.e., is a clamping diode always stopping positive from reaching negative, or vice-versa, or doesn't it matter?
Would it hurt/help/not matter to also include another diode "pointing" in the opposite direction across the same wires? (Since the diodes are so cheap, and some of the electronic components so expensive.)
Would I need another diode on the Timer Relay? If so, between which wires, and in what direction? ("A1" and "A2" are constant, with a trigger signal coming in on "S" to kick off the timer.)
With those diode(s) in those locations, would all the components of the system be adequately protected?
John
Does it matter which way the 1N4004 diode is "pointing"? i.e., is a clamping diode always stopping positive from reaching negative, or vice-versa, or doesn't it matter?
Would it hurt/help/not matter to also include another diode "pointing" in the opposite direction across the same wires? (Since the diodes are so cheap, and some of the electronic components so expensive.)
Would I need another diode on the Timer Relay? If so, between which wires, and in what direction? ("A1" and "A2" are constant, with a trigger signal coming in on "S" to kick off the timer.)
With those diode(s) in those locations, would all the components of the system be adequately protected?
Relays:
--- 782XBXM4L-12D Magnecraft Electromechanical Relay, "Ice-Cube" Style, 16A DPDT, 12VDC Coil Specs
--- And the socket for it: 70-782D-1 Magnecraft Relay Socket, 8-pin Cube Style, 2 Pole, 16A, 300V, IP 20 (Finger-safe) Specs
--- Time-Delay Relay to feed 120VAC lighting circuit: 822TD10H-UNI Magnecraft 10 Function Programmable Time Delay Relay, 15A DPDT, Universal Coil Voltage 12 - 240 VAC/VDC Specs
Thanks for your help/thoughts!--- 782XBXM4L-12D Magnecraft Electromechanical Relay, "Ice-Cube" Style, 16A DPDT, 12VDC Coil Specs
--- And the socket for it: 70-782D-1 Magnecraft Relay Socket, 8-pin Cube Style, 2 Pole, 16A, 300V, IP 20 (Finger-safe) Specs
--- Time-Delay Relay to feed 120VAC lighting circuit: 822TD10H-UNI Magnecraft 10 Function Programmable Time Delay Relay, 15A DPDT, Universal Coil Voltage 12 - 240 VAC/VDC Specs
John