fuevarde
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Hi ,
Somebody make this ESR **broken link removed** , is working with on site firmware ?
Thank you
Costas
Hi,
yes, I did. The hex file work as is. I had to make some minor corrections:
1 - 220Kohm - LM393 pin 3 to +5V - this is to show the correct capacitance. You can modify this value until shown the correct value.
2 - replaced the R4 ( 22Kohm variable ) with 2 fixed resistors. 10K from -5V to R5 and aprox 7,5Kohm from +5V to R5. the 7,5K was made from 30K + 30k + 10k all3 in paralell.
3 - jumper jmp1 must be shorted. Is the supply for PIC.
I did use IRF640 instead of IRF530, VD4 and VD5 - 1n4148
It is working great. I can measure capacitors without desoldering them. Tested on Motherboard, VGA board, swiching power supply, inverters.
It cost me abbout 30 USD ( including plastic case and test leads )
Good luck.[/
Hi bkelciov, Good day, well two weeks ago when i look for a pic based ESR tester i found this forum. It really impressed me to do this project. Buddy i'm so frustrated. i tried two different circuit to acheive this go esr none of them work.
i used exact same components and i did the same modification you did it didn't work. All did different is i used BC327 Transistor and 4.7nf caps for C1 & C2. All i'm seeing on the display is just top line is lit no character and the bottom nothing.
What do you think any measuring points debug methods would you please help me. which firmware you used?
my doubts are 1. when i mesure the voltage pin 5 on ICL7660 & 5+ i'm getting almost 10 volts but the diagram says it is -5 volts
2. How come no supply voltage for the IC CD4066 vdd & vss (pin 14 &7)
Would please kindly help me to resolve this problem
Thank you in advance.
---------- Post added at 21:51 ---------- Previous post was at 21:42 ----------
Good day Costas, Great job where did you get the right firmware any links
Well two weeks ago when i look for a pic based ESR tester i found this forum. It really impressed me to do this project. Buddy i'm so frustrated. i tried two different circuit to acheive this go esr none of them work.
i used exact same components and i did the same modification you did it didn't work. All did different is i used BC327 Transistor and 4.7nf caps for C1 & C2. All i'm seeing on the display is just top line is lit no character and the bottom nothing.
What do you think any measuring points debug methods would you please help me. which firmware you used?
my doubts are 1. when i mesure the voltage pin 5 on ICL7660 & 5+ i'm getting almost 10 volts but the diagram says it is -5 volts
2. How come no supply voltage for the IC CD4066 vdd & vss (pin 14 &7)
Would please kindly help me to resolve this problem
Thank you in advance.
replace R30 and R31 with 22Ko variable and adjust until is showing something. Check to have 5V on PIC. VDD to GND. JMP1 must be shorted. If is not working is meaning that the program is not working inside the PIC. The reasons can be:
- PIC is defective
- the programm is not writen correctly in PIC
- Cr1 ( the 20MHz crystal ) is not working. This must not be a filter !!! It must be a crystal quartz.
- C5 and C7 must be 22pF not nF
- C1 and C2 can be 4,7nF. I did use 4,7nF too.
- VD4 is 1N4148
- check the continuity of the circuit.
To see what you must see on display, try to use the "Real PIC Simulator" or "PIC simulator IDE".
Good Luck !
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