Sine wave amplifier circuit using Op amp #2

Thread Starter

cale27

Joined Sep 8, 2020
5
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How can I customize for 0-24V and 0-48 V at 30khz
 

Thread Starter

cale27

Joined Sep 8, 2020
5
Hi folks,
Im new to analog design. My homework is to build a sinus and square wave generator
Vout1= 24V ; Vout2= 48V
fout (max) = 30kHz
I need to control this generator with arduino. (Choose voltage and frequancy)
I can amplify PWM from 0-5V to 0-24V (200kHz) but I dont know how to convert this signal to sine wave.
Sine wave should be 0-24V and 0-48 V

Thanks a lot
 

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MrAl

Joined Jun 17, 2014
7,799
Hello,

Without giving out too much info, to create a sine wave with a digital device you usually need to output a special pattern with PWM that mimics a sine wave average over a limited local time range. If you use for example a square wave then your filter had to be able to be tuned to different frequencies, which is possible but not that simple.
This is if you want low THD that is.
 

crutschow

Joined Mar 14, 2008
25,381
24V and 48V outputs can be done with a high voltage op amp if the output load is not a low impedance.
Is that voltage RMS?
 

Thread Starter

cale27

Joined Sep 8, 2020
5
24V and 48V outputs can be done with a high voltage op amp if the output load is not a low impedance.
Is that voltage RMS?
Output current should be max 50 mA. Nope, it not a Rms voltage. I only focused to generate the sine wave from square wave but I am open to different ways. I only need a sine signal at 24 and 48 V at max 30kHz
 

Audioguru again

Joined Oct 21, 2019
1,904
The input diodes clip when the input is 0.6V to 0.7V peak. Your input is 2.5V peak so of course the diodes are clipping.
Also your circuit gain is 1+ (249k/5k)= 50.8 times so the output will clip when the input is higher than 11V/50.8= 0.225V peak with no load.
 
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