I'm trying to trouble shoot a Timmy build. I plugged everything in and.. nothing. I quickly realized I had not put the ic in the socket. I corrected it but still nothing. Did I mess something up by doing this. I feel like without the IC current shouldn't be flowing, except through the power filtering section. but I haven't been able to find any other issues.
Nothing bad should happen by forgetting an IC, should just not get any sound. Only thing I can think off hand would be that some capacitors built up enough of a charge and the IC got enough of a shock to fry it when you plugged it in :-\ Make sure you don't have a dead chip then start posting voltages :P
Check your voltages and use an audio probe.
Josh
Couldn't find a list of voltages, does anybody have them handy?
I have a tl072 in it right now, because I was trying out a few chips to make sure that wasn't the problem. This is what I measured
1 9.21
2 5.07
3 5.07
4 5.02
5 0
6 4.64
7 5.07
8 5.07
Any thoughts?
either you labeled the pins backwards, or your IC is in backwards.
Quote from: HamSandwich on February 05, 2016, 09:34:55 PM
either you labeled the pins backwards, or your IC is in backwards.
Oops, I labeled them backwards. Good catch thanks. I should have written down the pins with the readings.. FAIL
Lets try this again
1 - 5.17
2 - 5.07
3 - 4.64
4 - 0
5 - 5.02
6 - 5.07
7 - 5.07
8 - 9.21
Without a link to a schematic, or even the layout you used, can't say for sure, but they are typical voltages for a TL072. Likely a wiring problem, but without pictures, or a schematic or layout, hard to tell. Audio probe is a good way to continue your trouble shooting.
I'll snap some pictures later. Thanks
In the meantime, check your values and reflow everything. You'd be amazed how many times that fixes things. After over 3 or 4 years of building, I had to do that 2 days ago. Makes me feel silly every time I do it.
Voltages look good. An audio probe is your best friend :)
Got it, thanks guys. The problem was actually a bad solder joint in my crappy testing rig. :P
I'm glad I thought to check the testing rig. I could have been troubleshooting thec Timmy for days.
Quote from: Matmosphere on February 06, 2016, 12:29:43 AM
Got it, thanks guys. The problem was actually a bad solder joint in my crappy testing rig. :P
That's a new one, I haven't seen that one yet.