Alternate switching design

I've put an animated gif online to help visualize what I need

Thanks again

1) How big are the relays ? i.e. whats the coil voltage ?

2) Are the three LEDs at the bottom, push buttons, or just LEDs to show the current state ?

3) Is the time delay between switching programmable ?? How do you want to control the time delay ?? ( pot, more DIP switches )

Do you need more then one ??

What should the packaging look like ??

How do you want to pay for this ??

donald

You have 3 boards, each with 6 relays. When you press the switch on board X, do you want all the relays that are on the other boards to de-energize, and only the relays that are selected by the dip switches on board X to energize?

If yes, the circuit below will de-energize the relays on the boards, and energize only the relays selected by the DIP switch on the board whose momentary switch is pressed:

PNP +12 -+--. .-------------------+---------+---------+ | e\\ /c | | | | --- [Board1] [Board2] [Board3] | | | | | | | [SCR1] [SCR2] [SCR3] | | Pb1 /| /| /| | | ___ | | | | | | `----------+--o o---[10K]--+ +---------+---------+--+ | | | | | | | | +--->|-------+ | | | | | D1 | | | | | | Pb2 | | | | | | ___ | | | | | +--o o---[10K]------------+ | | | | | | | | | | +--->|-------+ | | | | D2 | | | | | Pb3 | | | | | ___ | | | | +--o o---[10K]----------------------+ | \\ / | | | D4 --- +--->|-------+ | | D3 | | | | | `------+---[.1uF]------+ | | | | [1K] [10K] | | | | Gnd --------------+---------------+----------------------+

When a button (PB1, PB2 or PB3) is pressed on any board, the .1 uF cap charges, which causes the PNP to turn off briefly. That in turn causes any of the SCRs that were on to turn off, thus de-energizing the relays. When the PNP turns back on (very quickly, long before you can release the pushbutton), the button pressed turns on only the SCR on that board. The other boards can't energize their relays (until the button on them is pressed), but the SCR on the board whose button is pressed is turned on (and stays on until the next time a button is pressed) and the relays selected by the dip switch are energized.

Ed

First of all thank you Ed

Only one thing. I don't have 3 boards each with 6 relays. I have 3 controller boards and only 6 relays. The relays are the same, but each time I press the switch on a board, I want to energize the relays enabled in the DIP switches of that boar, but also de-energize the one that were previously energized. In other words, with the press of a switch on any board, I want to de- energize all the relays and then energize only the ones enabled by the board I pressed.

Thanks again

--
Very nice. :-)

I\'ve posted a schematic for you on
alt.binaries.schematics.electronic

I'm assuming these boards haven't been designed. DIP switches: one side to ground; other side to the D flip-flop inputs with pullups. Momentary switch: one side to ground; other side to the D flip-flop clocks with pullups, and to the clear inputs (through an AND gate) of the D flip-flops on the other two boards. D flip-flop Q outputs: to 4069 inverters.

Ah - got it. The SCR circuit should work fine for that. Wire the common of the dip switches to the SCRs. In the diagram, substitute "DIPA for "Board1", "DIPB" for "Board2" and "DIPC" for "Board3". The +12 line from the PNP will go to one side of all 6 relay coils. The outputs of each dip switch will connect to the other side of the respective relay coil through a diode. I'll draw a partial diagram below to show the dip switch wiring.

+---->|-----+ SCR1-+ DIPA | | | 1o-o--|