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| RLC project |
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| donthack22:
Hello guys, i am trying to do RLC1 project from this website. I got everything done on my perfoboard, but when i connect the 9v source i cand get 5V and -5v. I tried the to the first part of the circuit that uses those transistors on a breadboard and it seems i cannot obtain +5v using this schematic. I have done everything like in the schematic, i checked a lot of time. So i dont know what am i doing wrong. If anyone has some ideas i would be very grateful. |
| kripton2035:
which website ? |
| donthack22:
http://kripton2035.free.fr/LCR%20meters/lcr1-go-russian.html this website, your website. Sorry, i dont know why i didnt link it the first time. |
| Arznei:
What did you connect R34 (where it says "PWR ON RC7") to? If you left it floating and the capacitor C26 still has charge your circuit will not work. You can try to connect "PWR ON RC7" to the +9V input to check if that is the issue. Also make sure the Diode D3 is inserted in the correct orientation. Other than that I'm afraid I cannot help you without some more information. Like what voltages do you measure where the +5 and -5V are supposed to be? Do you measure 9V at the input of the 7805? Are you sure there are not shorts or missing connections? Maybe a photo could help and so on. |
| donthack22:
I had it connected to the RC7 pin of the microcontroller. I tried to connect it to the 9 V and it doesnt work, but if i connect the base of the bc548 tot he ground it works. Also if i put a wire between R34 pins it also works. But i cant understand why. And it also works if i get the PWR ON end to the barrel connector ground. The diode is in the right direction and i measure around 5v at the entry of 7805 if i dont do one of the things i listed. If i do one of them there are 5 V |
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