Each amplifier features JFET inputs (for high input impedance) coupled with bipolar output stages integrated on a single monolithic chip.įeatures of the TL072 are:(1)low power consumption (2)wide common-mode and differential voltage ranges (3)low input bias and offset currents (4)output short-circuit protection (5)low total harmonic distortion:0.003% typ (6)low noise Vn = 18 nV/Hz Typ at f = 1 kHz (7)high input impedance:JFET input stage (8)internal frequency compensation (9)latch-up-free operation (10)high slew rate:13 V/s typ (11)common-mode input voltage range includes Vcc+. The TL072 is designed as one kind of low noise JFET-input operational amplifier that is ideally suited for high-fidelity and audio preamplifier applications. Operating Free Air Temperature Range TL072C,AC,BC You will have to adjust the volume on the PC speaker to the desired level.WIDE COMMON-MODE (UP TO VCC +) AND DIFFERENTIAL VOLTAGERANGE Then you can use the probe to look at the signal output of the IC and see which output is bad. On the amp you are working on, you will have to feed it with some audio to the input. Just to be safe, you can attach 4.7K~10k resistor in series with the probe.
The ground wire will be attached to the metal chassis of what you are working on, then you can use either the left or the right channel wire (you will have to cut the audio cable up to attach the home made probe to this cable). Do you have something like a PC powered speaker of some sort? If you do, you will have a make a small probe, that can be attached to the powered speaker audio input, the input will have left and right channel and one ground.
To find out where you lost the audio, you will need an oscilloscope to trace out the signal, but I do not think you will have one, it will be hard to do.
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