NE555 ic getting hot and servo doesn't work

Thread Starter

mrnmir

Joined Nov 1, 2022
6
Hi there,

My ne555 timer circuit doesn't work, overcurrent is also detected. I post my scheme, pcb and proteus results. It works pretty fine in proteus (RV1 and C2 values are changed as in real.

Any ideas?

1708194165310.png

1708194078097.png1708194112336.png
 

KeithWalker

Joined Jul 10, 2017
3,096
Where is the power connected on the PC board? Make sure it is the right way round.

If the IC is getting hot then there is either:
1. A short on the circuit board.
2. A component is inserted the wrong way round.
3. A component is the wrong value or faulty.

To trouble shoot it:
1: Do a continuity check on a blank board. Do a visual check for solder bridges.
2. Do a careful visual check on the orientation of the components.
3. Measure the values of the passive components and check the diode.

If all else fails, replace the IC.
 

Alec_t

Joined Sep 17, 2013
14,321
If the pic is showing the solder side of a single-sided board then it looks as though the IC pins are the mirror image of what they should be.
 
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