16-08-2012, 07:04 PM
Yes, I'm still at large (as well as still being large!).
I had a further play this morning and there seemed to be an intermittent fault. I couldn't see any dry joints, shorted or broken tracks or anything so decided it was time to get some proper connectors fitted as all the croc clips wouldn't be helping. I also fitted the power supply components.
When I next tried it I found that the LM317 wasn't regulating. This had me well an truly puzzled and eventually I took it off the board to try to get it going on a breadboard. This quickly revealed that despite being a new National Semiconductor one the chip itself was u/s.
I can now find no signs of oscillation so one of the three-legged fuses may have copped a packet, though they shouldn't have as I was on a current-limited supply. After the afternoon's battle with the LM317 I'd had enough and will investigate tomorrow.
- Joe
I had a further play this morning and there seemed to be an intermittent fault. I couldn't see any dry joints, shorted or broken tracks or anything so decided it was time to get some proper connectors fitted as all the croc clips wouldn't be helping. I also fitted the power supply components.
When I next tried it I found that the LM317 wasn't regulating. This had me well an truly puzzled and eventually I took it off the board to try to get it going on a breadboard. This quickly revealed that despite being a new National Semiconductor one the chip itself was u/s.
I can now find no signs of oscillation so one of the three-legged fuses may have copped a packet, though they shouldn't have as I was on a current-limited supply. After the afternoon's battle with the LM317 I'd had enough and will investigate tomorrow.
- Joe
