hi
i would like to know if its possible to amplify an alternatimg current from a signal generator. i need an amplified ac signal to drive a coil winding
im from a mechanical back ground..... so it would help me if yu were a little specific..anyways i came to know that op amps would only amplify an dc signal is it true?.. thank you.
the frequency 15 hz- 1khz but i need to test it at 15 hz for sure. and voltage from the signal generator is 6.5 v .... the coil im using has a resistance of 400 ohm and the current through it is a 8.2 mA..... i would require more than a 30 mA....and the voltage amplified accordingly....
the frequency 15 hz- 1khz but i need to test it at 15 hz for sure. and voltage from the signal generator is 6.5 v .... the coil im using has a resistance of 400 ohm and the current through it is a 8.2 mA..... i would require more than a 30 mA....and the voltage may be a 30 v .....
, replace the LS1 with ground. You can set the amplification with the resistors R9 / R10 ( not inverting amp) . You wont have crossover because the polarisation with the diodes. I think you can set your coil in the collector branch with a diode across .
You need 2 transistors to amplify the positive and negative side of the sinus. You just give a little bit information, I dont know what your purpose it. You can"t expect that we can just post the right schematic.
You need 2 transistors to amplify the positive and negative side of the sinus. You just give a little bit information, I dont know what your purpose it. You can"t expect that we can just post the right schematic.
hi,
im trying to build a test rig with an input coil and an out put coil.... both having resistance of a 50 ohm...a magnet is placed in the input coil ... when i energise the input coil the magnet moves out into the output coil there by inducing an emf in to it..... the problem im facing now is that when im using a signal generator ... i m only able to supply the input coil with 6 volts and its producing a current of 65 mA in the 50 ohm input coil. i need to supply the input coil vith more power and current ....
p.s: i need the voltage at low frequencies also for testing purposes. (10hz -20khz)
i want to amplify the power with out affecting the frequencies.....
i used a function generator ..... which gave a sine wave of 7 volts pk-pk and the coil resistance was 50 ohm ... so i calcultaed the current across it... v=ir.... thats how i thought it worked isnt it?
I think I would go to radio shack and buy an lm386. https://www.electro-tech-online.com/custompdfs/2010/07/LM386.pdf
Use the diagram for the X20 amplifier and put your coil where the speaker is. You might want to make the 250 Ufd. capacitor larger (500 ufd.).
, replace the LS1 with ground. You can set the amplification with the resistors R9 / R10 ( not inverting amp) . You wont have crossover because the polarisation with the diodes. I think you can set your coil in the collector branch with a diode across .
hi kattoju,
If the coil resistance is 400R and it conducts 8.2mA, means the voltage source is normally 3.28V
If you require to drive 30mA thru the 400R this would require a voltage source of only 12V, a 30V source would drive a current a current of 75mA thru the coil.
These figures do not include the coils inductance, which you have not defined.???
hi kattoju,
If the coil resistance is 400R and it conducts 8.2mA, means the voltage source is normally 3.28V
If you require to drive 30mA thru the 400R this would require a voltage source of only 12V, a 30V source would drive a current a current of 75mA thru the coil.
These figures do not include the coils inductance, which you have not defined.???