Is Q1 a bipolar transistor as shown in the post above or a MOSFET as shown in post #10?

 

Is Q1 a bipolar transistor as shown in the post above or a MOSFET as shown in post #10?

Its a PZT2907A BJT

 

Come up with an issue now that the pcbs have been made. My 555 timer isn't outputting a pulse instead is a constant 12v.

Any ideas?

 

Solder short on the board somewhere or board not configured correctly.
Post a photo of the board to maybe see if the configuration is correct.

 

The circuit won't work, it was cross-posted at https://www.eevblog.com/forum/projects/motorcycle-flasher-circuit-validation/

 

Remove R2 or connect from pin3 to 12volts.
Don't need that large of a capacitor either. Change R1 to 47K and C2 to 47uf.

 

Breadboarded it works as expected but when soldered to the PCB the transistor is at a permanent 12v. Attached are the board and the schematic.

Values were corrected as per previous posts
R1=100K
R2=10K
R3=10K
R4=750
C1=10nF
c2=100nf (filtering)
C3=47uF

PNP can handle 600mA

Output from flasher pnp will go to switchgear to be switched to the correct indicator side.
SW1 and SW2 are purely to turn on the relay coil by switching it to ground.

 

Can't really tell. Do you have a meter to do some test?

 

Can't really tell. Do you have a meter to do some test?

Yeah meter and scope

 

If your ready I have time now to troubleshoot.

 

Are you free in about 30 minutes?

 

Yes

 

Yes

I'm free now

 

OK then get the volt meter ready and start with the voltage on pin3 of the 555

 

11.09v
Supply is 12v

 

And Q1 is ON? ,collector voltage reading.

 

Yes. Collector is at 12v

 

Voltage on the base of Q1?
Is the flasher connected?

 

Voltage at Base is 11.77v flasher is connected

 

Sounds like Q1 is shorted
Are the blue traces on the bottom side of the board