help copying a Circuit

[budm]

Re: help copying a Circuit

What are the GREEN and BLACK wires connected to?
What are the two VIOLET wires connected to? It looks like the load is inductive such as relay coil due to the present of D1 for snubber.
What are the value of C2, C3, and C6?
I will draw up the SCH later once I know what are those wires are connected to.
BTW, the bottom side is not focused well, so I hope my tracing is correct.

[budm]

Re: help copying a Circuit

PCB just to give some ideas, will need cap's values and lead spacings, TRIM pot size and value and maker, PCB required size and mounting info. Shown bottom view and final clean up will be needed.

[predator0357]

Re: help copying a Circuit

PCB just to give some ideas, will need cap's values and lead spacings, TRIM pot size and value and maker, PCB required size and mounting info. Shown bottom view and final clean up will be needed.

the two big caps at the bottom is 100uF 35V the mid cap on the side is 2.2uF 63V the two ceramic caps are 103 and the tiny cap is 104, the trim pot 204B6 the size approx 0.8CM, the size of the PCB is 6.4CM X 4.2CM but it can a little bigger. and i am pretty sure that R2,R3,R4 are 2.2Kohm from the pic but tomorrow i will check again.

And i forgot to upload this pic:-) u can see in the pic that the wires goes to a relay, all the wires the violets n the green red n blacks connected to the relay

[budm]

Re: help copying a Circuit

I gave you the designators for the component, so "two ceramic caps are 103 and the tiny cap is 104" which are which?
"trim pot 204B6" Is that all printed on the body of the trimpot? 200K Ohms pot?

"the size of the PCB is 6.4CM X 4.2CM but it can a little bigger." there are many unused pads, so you still want it to be bigger than 6.4CM X 4.2CM? What is the exact size do you want?

"u can see in the pic that the wires goes to a relay, all the wires the violets n the green red n blacks connected to the relay" they cannot all go to the relay since the red and black at the bottom are for the power supply. I see the green and the black go to the black terminal. The pictures do not show how the wires are connected to the relay, you need to do better than that by drawing out the wiring diagram.

The Green and the Black are for the Triggering the timer by momentary shorting the Green and the Black wires together to start the timer (Monostable), the time is = 1.1 x C6 x VR1 = the amount of time pin 3 will stay high (RED LED and RELAY = ON).

The two Violet wires should go to the relay coil, it is 12V relay coil based on the pictures.

You should at least read the LM555 data sheet and look at the MONOSTABLE circuit to understand how it works.

[predator0357]

Re: help copying a Circuit

I gave you the designators for the component, so "two ceramic caps are 103 and the tiny cap is 104" which are which?
"trim pot 204B6" Is that all printed on the body of the trimpot? 200K Ohms pot?

"the size of the PCB is 6.4CM X 4.2CM but it can a little bigger." there are many unused pads, so you still want it to be bigger than 6.4CM X 4.2CM? What is the exact size do you want?

"u can see in the pic that the wires goes to a relay, all the wires the violets n the green red n blacks connected to the relay" they cannot all go to the relay since the red and black at the bottom are for the power supply. I see the green and the black go to the black terminal. The pictures do not show how the wires are connected to the relay, you need to do better than that by drawing out the wiring diagram.

The Green and the Black are for the Triggering the timer by momentary shorting the Green and the Black wires together to start the timer (Monostable), the time is = 1.1 x C6 x VR1 = the amount of time pin 3 will stay high (RED LED and RELAY = ON).

The two Violet wires should go to the relay coil, it is 12V relay coil based on the pictures.

You should at least read the LM555 data sheet and look at the MONOSTABLE circuit to understand how it works.

First: the ceramic caps are C1 and C5 are 103.
Second: C4 are the tiny cap 104
And yes on the trim pot only printed the "204B6"
For the size smaller is better but i meant that if it cant fit to the "original" size it can be bigger.
For the wires i think it doesn't matter cuz i am gonna replace the cards on the billboards with the old one so i just need to see what connects to what, its not that i need the connect to new billboards.

[budm]

Re: help copying a Circuit

So how are you going to build the prototype to verify the circuit function and parts' fitting and parts'foot print?

[budm]

Re: help copying a Circuit

These are the SCH and the PCB.

[predator0357]

Re: help copying a Circuit

So how are you going to build the prototype to verify the circuit function and parts' fitting and parts'foot print?

what do u mean "So how are you going to build the prototype to verify the circuit function"?
I am gonna draw real a prototype PCB on piece of paper and on it i am gonna draw the parts. :-)

[budm]

Re: help copying a Circuit

So you have enough info based on what I provided to you?

[predator0357]

Re: help copying a Circuit

So you have enough info based on what I provided to you?

yes i think, but to day i will check the the billboards card again.

tnx a lot for the help n understanding me to all ;-)

[keeney123]

Re: help copying a Circuit

You are amazing BudM. What I call a complete tech. Good to know people like you still exist.

[budm]

Re: help copying a Circuit

Some interesting info about driving the relay on page 7.

[budm]

Re: help copying a Circuit

So OP has no feedback on this project?