Okay, I just spent like a whole two hours assembling a little TDA1519A pocket amplifier. Got it together and turned it on, no smoke 🙂 Measured output to ground, and damn, there is a lot of DC. On channel has +5, other has -5. No load or input connected.
Checked power supply voltage, my wiring, soldering, PCB layout, everything seems to be in order.
I've used this chip once before, and it worked then. Did I maybe, I don't know, hurt the little guy when de-soldering it? I had it point-to-pint before.
Weird thing is that there is 5V DC both before and AFTER the output caps. Using 3300uF United-Chemicon caps bypassed by 150nF film. Power supply is an SMPS from an old DVD player, only for test purposes. Power supply rail measures 11.89V.
Help please? 🙂 If this ain't gonna work, I'll re-use the enclosure and connectors for a pocket headphone amplifier.
Checked power supply voltage, my wiring, soldering, PCB layout, everything seems to be in order.
I've used this chip once before, and it worked then. Did I maybe, I don't know, hurt the little guy when de-soldering it? I had it point-to-pint before.
Weird thing is that there is 5V DC both before and AFTER the output caps. Using 3300uF United-Chemicon caps bypassed by 150nF film. Power supply is an SMPS from an old DVD player, only for test purposes. Power supply rail measures 11.89V.
Help please? 🙂 If this ain't gonna work, I'll re-use the enclosure and connectors for a pocket headphone amplifier.
I just realized I kind of posted it in the wrong forum, this should go under chipamps 😀
Sure, I'll draw the schematic. Will be a few minutes.
Sure, I'll draw the schematic. Will be a few minutes.
Laziness got the best of so I just Googled for a schematic.
http://www.futurebots.com/1519a.gif
This is what I use. Power cap 3300uF, inputs 220nF+330nF, outputs 3300uF+150nF.
RCA inputs, 6.3mm jacks for outputs. Twisted pair input and output cables.
Very simple. Not much that can go wrong here. I guess maybe a problem with the output caps? They should be fine, tho, they used to work fine...
http://www.futurebots.com/1519a.gif
This is what I use. Power cap 3300uF, inputs 220nF+330nF, outputs 3300uF+150nF.
RCA inputs, 6.3mm jacks for outputs. Twisted pair input and output cables.
Very simple. Not much that can go wrong here. I guess maybe a problem with the output caps? They should be fine, tho, they used to work fine...
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