Steve2381
Senior Member
Hi
We are trying to fix a bit equipment at work.
Its basically a circuit (SMT so hard to read components and see the PCB tracks)... that can either receive a 230v input or a 24v input and it operates a 12v solenoid.
The 230v input is pretty self explanatory, but we don't understand the point of the LM358 op-amp. Its more than highly likely that we have traced the circuit slightly incorrectly, as access to the PCB is difficult.
I am thinking its for signal cleaning? We are not even sure why its needed? Could the same outcome not be achieved a lot simpler?
For those who use SMT parts, any help identifying the caps. The smoothing cap has 100 & 255 written on it. The other cap has 10 & 165 on it.
In my haste to scribble the circuit down, its quite probable I have got the diodes the wrong way round. My old man eyes had trouble enough reading what I could.
Finally, the large 68R resistor across the output of the 230v - 12v PSU. Is that just a dummy load to stabilise the output?
We are hoping to fix this unit, and then make our own with a Picaxe to control some delay features.
Thanks guys
We are trying to fix a bit equipment at work.
Its basically a circuit (SMT so hard to read components and see the PCB tracks)... that can either receive a 230v input or a 24v input and it operates a 12v solenoid.
The 230v input is pretty self explanatory, but we don't understand the point of the LM358 op-amp. Its more than highly likely that we have traced the circuit slightly incorrectly, as access to the PCB is difficult.
I am thinking its for signal cleaning? We are not even sure why its needed? Could the same outcome not be achieved a lot simpler?
For those who use SMT parts, any help identifying the caps. The smoothing cap has 100 & 255 written on it. The other cap has 10 & 165 on it.
In my haste to scribble the circuit down, its quite probable I have got the diodes the wrong way round. My old man eyes had trouble enough reading what I could.
Finally, the large 68R resistor across the output of the 230v - 12v PSU. Is that just a dummy load to stabilise the output?
We are hoping to fix this unit, and then make our own with a Picaxe to control some delay features.
Thanks guys