A
Alan Smithee
Guest
OK, so my circuit doesn't work !!! Ahhhh!!!!
I'm following Bill Bowdens circuit "Whistle flip flop" -
http://ourworld.compuserve.com/homepages/Bill_Bowden/page4.htm#whistle.gif
The small changes I've made:
Replaced the 1458 with a 5532
Added a 68ohm resistor between the power supply and Q2 (a PN2222A)
Replaced the solid state relay with a laser
I couldn't get a PCB mounted condenser mic, so I've used a miniature from
maplin
Running off 9V not 12V
I've double checked the tracks and I'm sure I've routed it properly
I did get the cap values wrong (0.1uF instead of .01uF), but that's OK now
Good solders, diode right way round as too the transistors and polarising
caps
The way the maplin catalogue suggests to wire the mic up involves a 4.7 uF
polar Cap - could this have something to do with it?
WHAT GIVES????? any idea - help would be much appreciated
Thanks
I'm following Bill Bowdens circuit "Whistle flip flop" -
http://ourworld.compuserve.com/homepages/Bill_Bowden/page4.htm#whistle.gif
The small changes I've made:
Replaced the 1458 with a 5532
Added a 68ohm resistor between the power supply and Q2 (a PN2222A)
Replaced the solid state relay with a laser
I couldn't get a PCB mounted condenser mic, so I've used a miniature from
maplin
Running off 9V not 12V
I've double checked the tracks and I'm sure I've routed it properly
I did get the cap values wrong (0.1uF instead of .01uF), but that's OK now
Good solders, diode right way round as too the transistors and polarising
caps
The way the maplin catalogue suggests to wire the mic up involves a 4.7 uF
polar Cap - could this have something to do with it?
WHAT GIVES????? any idea - help would be much appreciated
Thanks