W warlc Member Feb 14, 2009 #21 another breadboard view i have attached another view of the braedboard showing the tranisitor better Attachments timer555-5.jpg 40.8 KB · Views: 120
duffy Well-Known Member Feb 14, 2009 #22 Are you using the red wire from the battery for + or -? Should be +, but you have it hooked up like it's -.
Are you using the red wire from the battery for + or -? Should be +, but you have it hooked up like it's -.
W warlc Member Feb 14, 2009 #23 sorry, no i'm using two 9v battery clips together so that reverses the color code on one. blk is + and red is -
sorry, no i'm using two 9v battery clips together so that reverses the color code on one. blk is + and red is -
duffy Well-Known Member Feb 14, 2009 #24 So what happens when you short the collector to emitter with a wire? Does the relay pull in?
W warlc Member Feb 14, 2009 #25 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
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
W warlc Member Feb 14, 2009 #26 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
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 Well-Known Member Feb 14, 2009 #27 warlc said: 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 Click to expand... No relay, but the relay energizes?
warlc said: 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 Click to expand... No relay, but the relay energizes?
W warlc Member Feb 14, 2009 #28 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?
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 Well-Known Member Most Helpful Member Feb 14, 2009 #29 Datasheetarchive.com does not list a BC540A transistor. What transistor did you use?
W warlc Member Feb 14, 2009 #31 they're probably "floor sweepings " the new one i replaced is marked "4n2 410L 348" how's that. i bought them from jameco.
they're probably "floor sweepings " the new one i replaced is marked "4n2 410L 348" how's that. i bought them from jameco.
audioguru Well-Known Member Most Helpful Member Feb 14, 2009 #33 How can we help you fix your circuit when you have a no-name-brand unknown transistor?
W warlc Member Feb 14, 2009 #34 i put in a 2n3904 which is marked "2n3904" no change in the circuit any ideas?
W warlc Member Feb 14, 2009 #37 i cain't run the circuit on 12 volts because that would burn out my relay (i answered my own question)
i cain't run the circuit on 12 volts because that would burn out my relay (i answered my own question)
duffy Well-Known Member Feb 14, 2009 #38 Pins 2 and 6 don't seem to be connected to that cap, check that.
W warlc Member Feb 14, 2009 #39 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
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