Special Mike
New Member
I need to build a circuit for the Motorola radio console that will decode 4-beep tone signal (received page signal) and trigger a small flashing led.
I used a 567 decoder which converted it into a nice pulse output. Then I used 4017 to count pulses to 3 and reset on 4. However the LED on the output instead of flashing once on every 3rd count just starts behaving erratically as you can see from pics below... I tried using 4520 binary counter but still no dice...
pics:
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**broken link removed**
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any help whould be appreciated... I will quickly put together a diagram if needed when i get time, but its pretty straightforward circuit
I used a 567 decoder which converted it into a nice pulse output. Then I used 4017 to count pulses to 3 and reset on 4. However the LED on the output instead of flashing once on every 3rd count just starts behaving erratically as you can see from pics below... I tried using 4520 binary counter but still no dice...
pics:
**broken link removed**
**broken link removed**
**broken link removed**
**broken link removed**
any help whould be appreciated... I will quickly put together a diagram if needed when i get time, but its pretty straightforward circuit