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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
converting a signals voltage range?
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voks



Joined: Sep 09, 2008
Posts: 6
Location: Copenhagen

PostPosted: Fri Jul 27, 2012 9:03 am    Post subject: converting a signals voltage range? Reply with quote  Mark this post and the followings unread

Hello

I am fixing an old electronic organ where the top octave generators are broken. I am trying to get a signal from Arduino to match what was originally sent from the IC's. In order to do that i have to convert a squarewave from Arduino going from 0 - 3.3 V to a signal going from -12 - 0 V. I am using the organs 12 V and -12 V supply.

Using an inverting amplifier built with a LM741 op-amp i got an OK result. The squarewave is not really square anymore but it has the correct range of voltage. I am wondering if anyone here has an idea for a simpler or more effective way to do this?

Mikkel
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State Machine
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PostPosted: Wed Sep 19, 2012 10:16 am    Post subject: Reply with quote  Mark this post and the followings unread

You could just use an amplifier with a faster slew rate. Just make sure you use decoupling capacitors right at your amplifier as now the GBW will be higher.

The 741 is quite slow and thus you need a higher dV/dT or rate of change.

Bill
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