power amplifier- pls help me

nza0104 · 2010-12-02T15:47:29+00:00

Hi! I'm currently trying to amplify the power so that the power from my digital to analog converter can turn/ drive my motor using LM675 as in the first page of this datasheet: #-Link-Snipped-# I just replaced the RL with my motor, but how can I: 1. Set the gain of the power amplifier? Is it by changing the 20k resistor only? 2. How can I know/ verify what is the power amplifier gain without having to measure the voltage & current? 3. How to limit/reduce the amplified power so that it is not excessive or will not damage my motor? 4. I'm trying to make the motor to turn in both cw and ccw directions, but after implementing this amplifierãas in page 1 of the datasheet, it only turns cw. How can I make it turn in both direction? I have a dual power supply.ãDo I need to use the circuit as in page 8 "Servo Motor Control"? If yes, how can I set the amplifier gain? Is it by changing the 1M resistor only? Sorry if my questions sound stupid/ very basic. Thanks

power amplifier- pls help me

nza0104

Member

Updated: Oct 15, 2024

Views: 1.1K

Hi!
I'm currently trying to amplify the power so that the power from my digital to analog converter can turn/ drive my motor using LM675 as in the first page of this datasheet:
#-Link-Snipped-#
I just replaced the RL with my motor, but how can I:
1. Set the gain of the power amplifier? Is it by changing the 20k resistor only?
2. How can I know/ verify what is the power amplifier gain without having to measure the voltage & current?
3. How to limit/reduce the amplified power so that it is not excessive or will not damage my motor?
4. I'm trying to make the motor to turn in both cw and ccw directions, but after implementing this amplifierã€€as in page 1 of the datasheet, it only turns cw. How can I make it turn in both direction? I have a dual power supply.ã€€Do I need to use the circuit as in page 8 "Servo Motor Control"? If yes, how can I set the amplifier gain? Is it by changing the 1M resistor only?
Sorry if my questions sound stupid/ very basic.
Thanks

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aj_onduty

Member • Dec 2, 2010

For question no. 4, Please use the L293D. It is a H-bridge motor driver. It will give you the capability to rotate it cw and ccw. Can you tell me which motor are you using? I mean its ratings.
Thanks. Please correct me if I am wrong.

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Harshad Italiya

Member • Dec 2, 2010

First of all warm welcome to CE.

Can we know what actually you want to do?
If you want to drive Motor only then as said by AJ L293D is ok.. but before that if possible please reply with your Motor ratings and if possible then datasheet also. You need not to use extra Power Amplifier Chip, Motor Driver Chip will do that power amplification.

I'd used L293D for 12V Stepper Motor.

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nza0104

Member • Dec 26, 2010

thanks 😀😀😀

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