Circuit Madness
Hey guys, this isn’t for class, but I am having some SERIOUS trouble getting this working, and even with Katherine’s help and patience, I couldn’t get it working…
It’s a call detect circuit that should (I think) detect rf pulses… Here’s the circuit diagram and parts list….
Parts:
R1—————————————————100K 1/4W resistor
R2—————————————————3K9 1/4W resistor
R3—————————————————1M 1/4W resistor
C1,C2———————————————–100nF 63V polyester capacitor
C3—————————————————220uF 25V electrolytic capacitor
D1—————————————————LED 10mm ultra bright
D2—————————————————1N5819 40V 1A schottky barrier diode
Q1—————————————————BC547 45V 100mA NPN transistor
IC1—————————————————7555 CMOS timer IC
L1—————————————————-Coil sensor
B1—————————————————-1.5V battery
And here’s what I’ve got going…
Any suggestions would be highly appreciated.
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