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Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
found a failure but dont know the reason, when i measure the voltages on every ic socket while all ics are out i measure the exact 5 volts on the logic and 15 volts on the driver ics and lm311 and ne555, but when i put in the 74hc14 or 74hc 109 the logic voltage increases to 11 volts and i dont know why, i checked the whole pcb and there are no shorts or something else on the back and its only a 1 sided pcb . please, if someone has time, check out my pcb and compare it with steves drsstc guide driver, i dont know what to do,
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
I had issues with schottky diodes clamping rails doing that....
15V on UCCs, 5V on 4046...
Except as soon as you added the diodes, I don't know if they sent the regulator crazy, but everything went wrong. =P No, they weren't incorrectly biased. ^^
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
gdt was not connected, its only the driver which draws around 200mA without any load, in cause of this obvious failure that the 5 volt logic goes up to 12 volts when a 74hc14 or 74hc109 is in the socket
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Is your interrupter a 12V signal? I bet that somewhere, you are pumping too much voltage into the 5V chips, and the clamping diodes inside the chip are sending that energy to the supply, charging it up to 12V.
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
interrupter is 9volt signal with an 1k damping resistor ,this is what i used in all my drsstcs so it cant be the problem, . and the problem still exist without any interrupter connected
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Is your interrupter a 12V signal? I bet that somewhere, you are pumping too much voltage into the 5V chips, and the clamping diodes inside the chip are sending that energy to the supply, charging it up to 12V.
I considered that but I erased the sentence from the post
With series resistor that couldn't happen, and chip's diode will just clamp off small current to supply rail.
If there was no resistor NE555 output or 74HC14 chip itself would die much before they manage to mess up the regulator and increase logic supply voltage like such.
It just seems to be a dead regulator or etc. (78xxx sometimes do very wierd things when they die)
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
yeah found the failure on my pcb, its within the board file, a wrong jumper was set through pin3 of the ucc driver ics to +12 volt causing pin 4 from 74hc14 and pin 7 from 74hc109 floating at +12volt , now everything should work, still on testing
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Weekend DRSSTC
and i dont know why, i checked the whole pcb and there are no shorts or something else on the back and its only a 1 sided pcb . please, if someone has time, check out my pcb and compare it with steves drsstc guide driver, i dont know what to do,
