Trouble using a 741 op-amp

  • #1
i am new to most of this so my confusion is basic. here is my problem.

I am using a 555 timer to create a squarewave frequency of between 20-80khz

BUT the output is 1vpp. i am using this to drive a motor and need to up the voltage and current. i know what i need to use i just cant for the life of me figure out how to set up the op-amp to get say 5v's or so.

after the opamp i plan to use a transistor in an emitter follower configuration to drive the motor
 

Answers and Replies

  • #2
vk6kro
Science Advisor
4,081
40
Maybe I'm reading it wrong, but are you calling a 555 an opamp?

It isn't. A 555 is a timer chip and it produces an output on pin 3 of something close to its supply voltage. if you had a 5 volt supply, you should be getting pulses varying from almost zero volts to almost 4.5 volts positive.

See this site for a nice calculator, but also a diagram of the pinout of the 555.
http://freespace.virgin.net/matt.waite/resource/handy/pinouts/555/index.htm
 
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