LM3900 PDF

LM LM LM Quad Amplifiers. General Description. The LM series consists of four independent dual input internally compensated amplifiers . Texas Instruments LM Series Operational Amplifiers – Op Amps are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for . lm are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for lm

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There is no common-mode voltage range at all! With the values shown, this circuit oscillated at Hz, the output swinging from near zero to The input and supply voltages can be exchanged to give a noninverting circuit. A Hz triangle wave from a function generator makes a suitable input. LM series amplifiers consist of four lm390 and internally compensated amplifiers that are designed for single and wide power supply voltage.

The usual lm39000 responds to a differential voltage at its inputs, but the LM responds to a differential current. Two mic audio inputs and two direct line inputs are available in this circuit. A voltage regulator with a Zener in the feedback loop is shown at the right. The first circuit to look at is the inverting amplifier, shown at the right.

These amplifiers provide a wide range of voltage inputs and very good response for all audio frequencies. When you test this circuit, the scope traces for input and output can be superimposed with proper setting of the gain, and the inversion is obvious. The Norton op-amp can also be used to make active filters and oscillators; see the National Semiconductors application note AN for details.


Multi channel audio mixer circuit. The difference is the 39k resistor at the noninverting input. The output goes from high to low when the input reaches 7 V, and from low to high when it goes below 6 V, with a hysteresis of 1 V.

An inverting Schmitt trigger is shown at the right. Its output swings from very near ground to a diode drop below the positive supply.

C5 is the output decoupling capacitor. In this case, the bias is about 10 x 0. The LM is very convenient for AC amplifiers. A relaxation oscillator is shown at the left.

The output, however, is a voltage as with the usual op-amp. Calvert Created 10 August Last revised 19 September Capacitors C1 to C4 are the decoupling capacitors for the corresponding channels. The LM is a pin DIP containing four identical op-amps, each with inverting and noninverting inputs and an output.

Buffered, this would be an easy way to get a sine wave. The relaxation oscillator lm900 use of a Schmitt trigger, with positive feedback. LM pin configuration and architecture. I think resistors R8 and R10 should be taken out.

Equal currents supplied to the two lm390 are not amplified. Multi-channel audio mixer circuit using LM john July 27, 4 Comments. The unity-gain buffer is a special case of the noninverting amplifier, shown at the right with biasing by means of a voltage divider. For a 12V supply, these levels are about 7.

The LM can use from 4 to 36 V total supply voltage. This is a very graphic illustration of Schmitt trigger operation. It looks like the same circuit for the usual op-amp, but here the resistors are necessary. The lm39900 terminal from each channel is ,m3900 to a single output line with a resistance not greater than K and produces a mixed audio at the output with very low noise. The measured values from the scope were 3.


Note the lm9300 for the Norton op-amp, that has a current source between the inputs, and an arrow on the noninverting input.

Quad Amplifier | LM

Lm9300, can I use 3. Instead of a differential amplifier, the input stage is the current-differencing circuit shown at the right. Again, the high input impedance of the voltage op-amp is not obtained.

The circuit is not as precise ln3900 the usual one, with small shifts due to the diode drops at the input, but the circuit is useful and furnishes a reasonable lm39900 resistance of 1M. Here, the current supplied by the output is returned to the inverting input, where it flows out the k bias resistor, so the bias is positive. This is a very rough calculation, so we expect only general agreement. The hysteresis can be displayed directly on the scope, using the X-Y display.

The slew rate of the LM was evident in the output waveform. LM multi-channel audio mixer.

National Semiconductor

The extremely high input resistance of the voltage or FET-input op-amp is not obtained, however. However, these op-amps lm9300 very different from the usual op-amp, and must be used in a completely different way.

By adding the same circuit parallel with this, you can increase the number of inputs according to the applications. Each input is connected to the inverting terminal of LM These are the trip levels expressed in currents.