The UTC LM is a precision, high speed, high gain operational amplifier that has been specifically designed for use in high slew rate and wide bandwidth. Page 1. Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8. LMP Datasheet, LMP PDF, LMP Data sheet, LMP manual, LMP pdf, LMP, datenblatt, Electronics LMP, alldatasheet, free, datasheet.
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LM318P DIP8 op-amp
I can see that the amplifier is actually amplifying, if I compare the strength of the input voltage versus the output voltage. But the problem is, it’s amplification level appears to be only a factor of 6x.
Why is the amplification factor so low, even through the datasheet states the the amplification factor is calculated based on: Another problem is that the speakers output is as quiet as an output from headphones. Even if I crank up the power supply of LM to 20v – the speakers volume doesn’t increase. As far as I understood, I will get very limited current supply out from the op-amp and won’t be able to drive the speaker directly, correct?
Do I need to drive the speaker with a transistor to make it louder or what would be the proper method?
LMP Datasheet, PDF – Alldatasheet
Thank you for you time. The LM xatasheet not designed to drive the speaker directly. The proposed follower would have a high current gain. The actual current gain is roughly the HFE of your transistors. This would raise the impedance that the LM opamp sees to several thousand ohms depending on transistor gain.
Now the opamp will perform as predicted and your gain equation will be valid. If you biased the follower well into class AB you should have something that will sound better than a chip at the expense of increased power drain.
better op-amp than TI LM318P ?
It seems that your IC can not provide enough current and it is not designed for audio applications. I suggest using LM it is a power amplifier not only a voltage amplifier and it can provide gain up to It is designed for audio applications.
Home Questions Tags Users Unanswered. Very little amplification when amplifying audio signal with LM Ask Question. Disconnect the speaker and re-measure gain.
Texas Instruments – datasheet pdf
An LM is not dqtasheet audio power amplifier. Why is the white lead connected to the – input? Also, is that really a stereo 3. You show three wires there.
LM is a typical BJT Op Amp with 33 Ohm output impedance and current limited to 20mA with internal Vbe drop but reducing gain from 1k to 1 also lowers output impedance but it is still current limited to about 0.
Complementary emitter followers inside the feedback loop will work.
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