Electronics > Projects, Designs, and Technical Stuff

Motorcycle Flasher Circuit validation

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Joe_echo:
I have an unforeseen issue. My 555 timer is now not pulsing now the pcbs have been made. Instead I'm getting a solid 12v on the output.

floobydust:
I told you it wouldn't work and you're not listening, never mind how many different forums you've put this on.

Joe_echo:
The circuit was breadboarded and worked as expected with the values posted. Calculations for the 555 cap and resistor combos give a frequency of around 1.5hz However on bench testing the pcb I get a solid 12v from the 555 output, instead of the pulsed signal expected. Nothing to do with your comments on transients etc.

Zero999:

--- Quote from: Joe_echo on February 26, 2025, 08:33:00 pm ---The circuit was breadboarded and worked as expected with the values posted. Calculations for the 555 cap and resistor combos give a frequency of around 1.5hz However on bench testing the pcb I get a solid 12v from the 555 output, instead of the pulsed signal expected. Nothing to do with your comments on transients etc.

--- End quote ---
Then it's:

* A mistake you made when designing the PCB.
* A PCB manufacturing fault.
* An error made when populating and soldering the components.

floobydust:

--- Quote from: Joe_echo on February 26, 2025, 08:33:00 pm ---The circuit was breadboarded and worked as expected with the values posted. Calculations for the 555 cap and resistor combos give a frequency of around 1.5hz However on bench testing the pcb I get a solid 12v from the 555 output, instead of the pulsed signal expected. Nothing to do with your comments on transients etc.

--- End quote ---

Logic then dictates your PCB has an error somewhere. Post pics so we can help.

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