Hi
I have built the attached circuit (on both sides of the chip) that uses a push button to trigger a CD4013 to switch between two LEDs and also switch a DPDT relay from NC to NO via a PNP transistor. Because I have used non latching relays (i.e. they reset when powered off) and that the CD4013 will power on at its previous (power on) state, I have put a 47k to ground and 0.1uF to vcc combo on pins 4 and 10 to reset the chip when power is removed-restored.
I have tested the whole setup and it draws between 10mA with both relays sitting in NC and 100mA with both relays switched to the NO pins.
I had intended to power it from a small wall wart supply, but I am now thinking that if I can alter the circuit to use latching DPDT relays I could remove the RC from pins 4 and 10 and run the box from battery power.
My question is simply, how can I get a short “trigger” pulse (>10ms) to set-reset a DPDT latching relay like a Zettler AZ832P2-2C-5DE (because I have some of these)?
Thanks.
I have built the attached circuit (on both sides of the chip) that uses a push button to trigger a CD4013 to switch between two LEDs and also switch a DPDT relay from NC to NO via a PNP transistor. Because I have used non latching relays (i.e. they reset when powered off) and that the CD4013 will power on at its previous (power on) state, I have put a 47k to ground and 0.1uF to vcc combo on pins 4 and 10 to reset the chip when power is removed-restored.
I have tested the whole setup and it draws between 10mA with both relays sitting in NC and 100mA with both relays switched to the NO pins.
I had intended to power it from a small wall wart supply, but I am now thinking that if I can alter the circuit to use latching DPDT relays I could remove the RC from pins 4 and 10 and run the box from battery power.
My question is simply, how can I get a short “trigger” pulse (>10ms) to set-reset a DPDT latching relay like a Zettler AZ832P2-2C-5DE (because I have some of these)?
Thanks.
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