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Having trouble building circuit?

David Lastname

May 14, 2018
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Hello, I'm building a circuit(the circuit diagram is attached) and I'm having trouble replicating it in real life. A picture of my current circuit is also attached. Can anyone give me any tips on what I can troubleshoot?

Thanks!
 

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AnalogKid

Jun 10, 2015
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Can anyone give me any tips on what I can troubleshoot?

No.

Is the circuit running too fast? Too slow? Did it burst into flames? Think about it - do you really believe that "I'm having trouble" is actual information?

However, the construction does need help.

Add a ceramic decoupling capacitor across the power and ground pins of each chip. Keep the leads as short as possible and connect as close as possible. Value can be anything from 0.1 uF to 1.0 uF.

Add an electrolytic capacitor across the two power buses, anything from 10 uF and 100 uF.

Reduce the length of all power and ground jumper wires.

ak
 
Last edited:

Chemelec

Jul 12, 2016
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Jul 12, 2016
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Put a Switch between pin 3 of the 555 and pin 1 of the other IC.
Makes Decision, Simpler than Lifting the wire.
 

kellys_eye

Jun 25, 2010
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The LEDs are 'shorted' - think about how the holes in the breadboard are interconnected!!!!!!

They are all connected to each other in a 'strip' and you've put the two LED wires in the same 'strip' of holes, effectively shorting them together.
 

KJ6EAD

Aug 13, 2011
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Turn the ICs right side up on the breadboard (pin 1 on the left). I can't look at it now.
 

Audioguru

Sep 24, 2016
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Making an electronic circuit on a solderless breadboard is a tangled mess of wires all over the place.
 

Audioguru

Sep 24, 2016
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The sloppy wiring mess caused the circuit not to work properly.
 

David Lastname

May 14, 2018
2
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May 14, 2018
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No.

Is the circuit running too fast? Too slow? Did it burst into flames? Think about it - do you really believe that "I'm having trouble" is actual information?

However, the construction does need help.

Add a ceramic decoupling capacitor across the power and ground pins of each chip. Keep the leads as short as possible and connect as close as possible. Value can be anything from 0.1 uF to 1.0 uF.

Add an electrolytic capacitor across the two power buses, anything from 10 uF and 100 uF.

Reduce the length of all power and ground jumper wires.

ak
Sorry for my lack of information. I have another working circuit to compare to, and it seems that there should be voltage on both sides of the capacitors, when there isn't. Any idea why that might be the case? I flipped them around and replaced them already.
 

AnalogKid

Jun 10, 2015
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If there are no voltages on either of the 555 capacitors, then the 555 has no power applied to it. Pin 5 should read a constant 1.67 V. The other end of each capacitor is connected to GND, so there will no voltage reading there.

ak
 
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