![]() ![]() I don't see an actual Bill Of Materials listed anywhere. I mean, the layout could be OK but the schematic is misleading. I'm wondering if the ladyada schematic guy had simply used the '072 Eagle library component and didn't change the value on the schematic to indicate the actual chip used (maybe a TLC2272 or some such thing). What is the marking on the 8-pin audio output device? I mean, there are dual Op Amps, in that same package with the same pinout, that will operate on a single 5-Volt supply. I would be interested to hear from anyone else who has used this product. I do not have a wave shield to test or to inspect but I have to ask whether you obtained the shield from ladyada (adafruit) or from somewhere else?ĥ. Not at any output current, let alone at with an output current driving a low impedance speaker or headphone device. I wouldn't expect the TL072 to be very linear with a single +5 volt supply. ![]() I have not actually tested a TL072 using a single 5V supply, but I have used that family of devices (many, many, many years ago) using +- 12 Volt balanced supplies. The TL072 definitely can not supply 100 mA output current. The ladyada description says that the Op Amp can supply 100 mA per channel. The TL072 is definitely not rail-to-rail. The ladyada description does not mention the Op Amp device type, but it says that it is rail-to-rail. If your board actually contained a TL072, then I offer the following observations:ġ. Not unless there is some device designated "TL072" that is not the same as the original (30-year old) TI part focus.ti.com/lit/ds/symlink/tl071.pdf (See Footnote.) That's the schematic symbol, but I can't believe that a TL072 will work in that application. I see the ladyada wave shield schematic shows a TL072 output amplifier. ![]()
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