The LT is the lowest noise audio operational amplifier available. This ultralow noise performance 0. At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Phono preamp from the LT datasheet. Hi all, I would like to build the phono preamp from the LT datasheet, the schematic shown on the first page of the document. This will be used with a Dynavector 20X-L. I can always go by trial and error What is the purpose of the 3n9 capacitor connecting the output to the ground? What about the 25K resistor marked as RL?

There is no coupling capacitor in the output of this circuit, should I add one, or is this not necessary with this topology. What is the purpose of the uF and 4.

If 12 volts is possible I could try to power it with batteries Thank you in advance, Luis. Find More Posts by luis. I have made a pcb for this design. It's not very critical the JFET. The resistor should be ohms I should think. Low noise level is achieved with a low ohmish feedback network as it is now!

The 3n9 is a filter to remove a zero which has to do with that the amp is non-inverting. The filter will cancel this. The uF cap will set the DC gain to 1 and also the offset, around 1 mV or less. My design uses a DC servo whch takes care of that. The possible drawback is less output voltage and less headroom. Find More Posts by peranders. Does anyone have experience on this matter? Do they usually work hot? I am not sure what temperature they have, but I can keep my finger on them seconds.

Thank you for help, Marius. I went to a friend who is an engineer I am just an amateur and he tested the circuit to see if it oscillates or not. It does not oscillate so he said most likely the ICs work this way: warmer than other ICs. Then I decreased the power supply voltage from 18 to 15, as you are feeding the circuit with 15 V and so says the datasheet, despite the generic circuit from the datasheet is powered with 18 V.

Now everything seems to be just fine. Thank you! Last edited by saptemari; 21st February at AM. In the datasheet it is powered with 18V. I am asking because I have a variable regulator and I can set one voltage or the other, or any voltage between. Please let me know and thank you very much. BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is AM. Resources saved on this page: MySQL User Name.

Stay logged in? Mark Forums Read. Solid State Talk all about solid state amplification. Please consider donating to help us continue to serve you. Page 1 of 3. Thread Tools. Phono preamp from the LT datasheet Hi all, I would like to build the phono preamp from the LT datasheet, the schematic shown on the first page of the document. View Public Profile. Send a private message to luis. Send a private message to jcx. Find More Posts by jcx. Send a private message to peranders. Send a private message to saptemari.

Find More Posts by saptemari. This means my preamp is quite OK! Posting Rules. Similar Threads. Electret mic preamp - will phono preamp work?

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EN 14961-1 PDF

Datasheet Linear Technology LT1115

This ultralow noise performance 0. Voltage Noise: 1. They are found in measurement, switching, oscillator and transducer circuits. Additionally, bridge techniques are broadband, serving from DC to bandwidths well into the GHz range. The electrical analog of the mechanical beam balance, they are also the progenitor of all electrical differential techniques. Similarly, circuit designers have altered performance by adding active elements e. Resistance Bridges Figure 1 shows a basic resistor bridge.


Datasheet Analog Devices LT1115


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