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| Command 2 different Zettler AZ850 Microrelay each by two different switch |
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| SimoS:
Hello. I hope this is the right section to post this question about my project. I'm working to the renovation of a a tube amp and needed to have internally two relay (one for switch between 2 different master volume, the other to insert the lead channel) with 2 commands (on the front panel / by a footswitch). Unfortunately the only available voltage is the 6,3Vac of the heaters, but I cannot use it continously. The other issue is that the Zettler relay (a bistable latching single coil) need +/- in one sense to switch in one sense, and -/+ (reverse) to switch in the other sense. The solution I found, also looking to a different post on this websites is the following (attached the layout of the whole project, the specific part I'm talking about is at the bottom of the layout): 1) Converting the 6,3Vac to Vdc 2) Sending to the coil the + Vdc (from the front panel or from the footswitch) to switch in one sense, and charging an electrolytic cap connected to the other (-) pole of the coil 3) When the cap is charged the coil doesn't consume nothing more, and the only consume is related to the led 4) When I switch off the + supply the cap inverts the polarity on the coil and the relay switch on the other side I tested and the single command works good. My question now is how to manage two of this small circuits with the same supply without one interfere with the other. I introduced two diodes on the negative line but I'm not sure it's correct. Your opinion? Thanks PS Sorry for my orrible english |
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