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25 Threads found on tl072
If you just want that the circuit works somehow, then you can use almost any other Opamp. But if you want the same performance, then it might be difficult. Any OPAMP with input voltage range including negative rail and suitable output voltage range, tl072 e.g. won't work. Look for "single supply" or "rail-to-rail" OPs in a first o
An LM3900 is a very weird quad general purpose opamp. I have never seen one and I have seen thousands of audio circuits that use audio opamps. A TL071 single, tl072 dual and TL074 quad opamp are designed for audio with low noise, wide frequency response and wide slew rate, very low distortion and very low output impedance (the LM3900 has a high out
The graph of slew rate in the datasheet shows when a sinewave begins to be distorted by switching speed. The tl072 does very well up to 100kHz. A lousy old 741 opamp curls up and dies above only 9kHz. An LM324 and LM358 are useless above only 2kHz.
Hey All! I was checking out an Instructable at because I have some problems with my Y adaptor, so I wanted to find a better solution, and found this instructable. Right now I have one output, and two inputs, but I?m planning on adding a third device to the mix, so just in case I wan
Most opamp specs have a minimum, a typical and a maximum value. Each opamp is different even if they have the same part number and same manufacturer. The datasheet for the tl072 shows A graph shows the typical voltage loss with different load resistor values. With a +/-15V supply and a 200 ohms load resistance then the output voltage is typically
An LM324 is a noisy antique opamp. You should use an opamp designed and used for audio equipment like an TL071 single, tl072 dual or TL074 quad audio opamp, but there are many others. Don't put the mic in a tube that was suggested because then the tube will cause a huge resonant peak. Directional electret mics have a vent on their rear and sides to
Same formula. In your schematic you can ignore the current flowing into the '+' pin of the tl072 and calculate the power dissipated using Ohms law for R1 and R2 (hint: calculate the voltage across each to do this). The amplifier is wired for unity gain so assuming it has sufficient voltage on it's supply pins, the output voltage will be the same a
It looks reasonable to me. Do you have both the points marked 'Vb' connected to a supply of half VCC? If not, connect two 10K resistors in series across ground and VCC and use the center connection as the 'Vb' supply. You have not marked what kind of amplifiers you are using or what VCC actually is, be careful if using olde
The tl072 opamps and nearly all other opamps already have an internal frequency compensation capacitor that allows 100% negative feedback (gain of 1) without oscillation. Then their gain drops as frequencies get higher. The opamp in the IR3447 needs to operate at a high frequency with plenty of voltage gain so it uses a resistor in series with an e
The overheating could be caused by instability leading to ultrasonic oscillation. Have you checked the output of IC13 with a scope while it's misbehaving? tl072 won't overhead with high frequency large signal as long as it's not loaded with a large capacitance. The full schematic reveals a serious circuit problem, IC13B output is
LM358 is quite noisy, but if the microphone provides enough signal (>10 mV) it might be adequate. TL071 / tl072 are much better opamps, but need a higher voltage supply, like 12 V and the output should be capacitively coupled to the ADC pin, and the pin biased to VCC/2 with resistors. The problem with the schematic you posted is the low input i
The threshold voltage of a Mosfet is when it is almost turned off (0.25mA), not when it is turned on. When BJTs are used as emitter-followers at the output then they have no voltage gain so the circuit is stable. You show a TL082. Why not use an tl072 dual audio opamp instead that is a TL082 selected for low noise? It costs the same.
It had the typical tl072 Op-Amp, and I put in NE5532, and now find that the EQ sounds almost harsh. Doesn't sound plausible at first sight. Depending on the circuit impedance level, a slight decrease or possibly increase in noise level can be expected. Because both replacements OP's expose higher bandwidth, it can't be guaranteed
When probing pin 1 of the tl072 I can only hear a high pitched noise, I think the problem is coming from there. These may be parasitic oscillations. It is a typical problem when operating an op amp at high gain. There are a number of things to try in order to eliminate them. Connecting a resistor or capacitor at various points ar
I think tl072 is only intended to be used with symmetric power supply
Thanks. how about not having R3. It's effectively useless for a tl072 FET OP. Just omit it.
Hi folks. Sorry, BUt How can I change the default values for th voltages of a Chip? For instance I am using a tl072 OP-AMP in Proteus but The default voltage for it seem to be 5V even when I connect the higher voltages to pins #8 and 4 of the said chip. Or for some other chips There in no voltage pin connected to the chip so that I could c
My teacher require me use op-amp audio is located from ~ 200Hz to 14oooHz (if you need to calculate band pass filter for five band with op-amp you can use LF356 (MOSFET input) or tl072 and one for bass (TL071) with band pass filter between 200 -400Hz hope this help you..
The second IC is an inverting opamp with a gain of about 100,000 because it is missing an input resistor. So of course it is noisy. It is also shorting the output of the first opamp. Why would anybody use a lousy old LM358 for a mic preamp instead of using a low noise audio dual opamp like a tl072?
The tl072 opamp will not work properly with a 5V supply. You should use a rail to rail opamp instead. You are wasting many I/O pins driving transistors. You can use one port to load a register (five in your case) and a few logic pins to controll (chip select them). This will give some additional I/O pins. Also (as posted above) using a resistive di