Can anyone design my circuit?

[digger]

Hello there. I am wondering if some very kind person would be able to design a circuit for me and post it here? I need a 6 volt, pause/pulse, '1 shot' circuit with a switch. When the switch is closed, there will be a delay of 2 seconds before a single pulse of 1 second to power a 6v solenoid.

Thanks guys, if anyone can help it'd be much appreciated!

 

[ericgibbs]

hi,
This a common circuit using two 555 timers, can you follow it OK.?

 

[digger]

Hi, thanks very much for your help. A few questions; what is U2? This looks like a 12v circuit, do i just change the battery to 6v?

 

[ericgibbs]

Hi, thanks very much for your help. A few questions; what is U2? This looks like a 12v circuit, do i just change the battery to 6v?

hi,
Ignore U2 thats only for the simulator.
Use 6V instead of 12V if required , but you will of course need a 6V relay

 

[digger]

what are v1 and v3? What is the solenoid and what is the switch? Is the red v+ on the right connected to the top of the relay?

 

[ericgibbs]

what are v1 and v3? What is the solenoid and what is the switch? Is the red v+ on the right connected to the top of the relay?

I have simplified the circuit layout, can you follow it now.?

 

[carbonzit]

He's using a circuit simulator to get this schematic, so some things are for the benefit of the sim.

V1 is the starting pulse for the circuit; this will be supplied by closing your starting switch. (Your switch momentarily connects 6 volts to the base of the transistor through R2.)
V2 is the 6-volt power source.
R9 in the second picture is the relay coil.
Everything else is just as it's shown on the schematic.

 

[crutschow]

You can also use one 556 which is two 555's in one package

 

[digger]

Thanks guys. Got a better idea of it now. The 556 is a good tip 'cos I need it to be as compact as possible, although I wouldn't have a clue how to use it? So V1 is not an actual component?

 

[digger]

I'll try again; V1 is the switch? So what is V3?

 

[carbonzit]

I'll try again; V1 is the switch? So what is V3?

I mis-wrote in my earlier reply. V3 is the pulse. Don't worry about it: just replace it with your pushbutton switch (to your V+ supply, 6 volts).

The 556 is exactly like the 555, except that it has a pair of identical twins. Just follow the pin assignment numbers and you'll be fine. (Vcc and Vdd are shared, so you don't have to connect those twice like you would with two 555s.)

 

[StudentSA]

In the simplified last circuit posted, V1 is your battery/powersupply and V3 is the switch

 

[digger]

Ok, completely understand now. To the breadboard...