Could use assistance on a timer project

[warlc]

another breadboard view

i have attached another view of the braedboard showing the tranisitor better

 

[duffy]

Are you using the red wire from the battery for + or -? Should be +, but you have it hooked up like it's -.

 

[warlc]

sorry, no i'm using two 9v battery clips together so that reverses the color code on one. blk is + and red is -

 

[duffy]

So what happens when you short the collector to emitter with a wire? Does the relay pull in?

 

[warlc]

when i jump the col emitter the relay goes on and stays on until i shut it down
could i be using a pnp instaed of an npn markings are bc540a

 

[warlc]

i changed the 555 to a new cmos one (my last one) no relay. when i jump collector and emitter relay energizes but releases when i remove the jumper

 

[duffy]

i changed the 555 to a new cmos one (my last one) no relay. when i jump collector and emitter relay energizes but releases when i remove the jumper

No relay, but the relay energizes?

 

[warlc]

by "no relay" i mean nothing happens when i turn on the circuit and bring pin to vcc. i'm wondering iof i could run this circuit on 12 volts. nothing would burn up would it?

 

[audioguru]

Datasheetarchive.com does not list a BC540A transistor. What transistor did you use?

 

[duffy]

Yes, what exactly is that thing?

 

[warlc]

they're probably "floor sweepings " the new one i replaced is marked "4n2
410L 348" how's that. i bought them from jameco.

 

[duffy]

Nope. Nuh-uh. Sorry. Ain't gonna do it.

 

[audioguru]

How can we help you fix your circuit when you have a no-name-brand unknown transistor?

 

[warlc]

i put in a 2n3904 which is marked "2n3904" no change in the circuit
any ideas?

 

[duffy]

What is the resistance of the 6V relay coil?

 

[warlc]

the relay coil is 115 ohms. can i run this circuit on 12 volts?

 

[warlc]

i cain't run the circuit on 12 volts because that would burn out my relay
(i answered my own question)

 

[duffy]

Pins 2 and 6 don't seem to be connected to that cap, check that.

 

[warlc]

pins 2 and 6 go to the 470k (replaced witha 10k) then a 1k then the diode connected to pin 3. pin 7 is connected to the 1k then 15k then 100uf cap

 

[duffy]

Take another look at what else the cap is connected to.