Electronics > Beginners
LM741 connections with signal generator
iMo:
Better start a different topic on -15V provided you have searched for it and have not find a suitable schematics..
Zero999:
--- Quote from: Gazmon on March 24, 2019, 10:30:26 am ---What’s easiest way to get a 15v negative power supply or can anyone provide a schematic I can build easily
Thanks for the help
--- End quote ---
My advice is don't. If the signal is AC, keep the capacitors, bias the non-inverting input at half the supply and connect R1 to 0V, via a capacitor.
What's the lowest frequency? You might need to increase the capacitor vales. I've changed them to polarised, just in case you want to use electrolytic.
Gazmon:
--- Quote from: imo on March 24, 2019, 11:18:21 am ---Better start a different topic on -15V provided you have searched for it and have not find a suitable schematics..
--- End quote ---
Sorry for the basic questions here , just wanted to check a few things ,
From you schematic
Vop+ Connection on the Lm741 what’s feeding in here? , the non inverting - connection on the Lm741 is connected to ground via R1, so there’s no 15v negative dc - needed here ?
iMo:
In my first schematics you need two voltage sources, Vop+ and Vop-. The GND (ground) is in the "middle" of both sources.
The input and output is referenced against the GND.
There is the version from Zero999 - where you are using only a single voltage (Vop+ .. GND) while you create "a virtual GND" through the two resistors.
You may take two 9V batteries and play with the 741. See below.
In a schematics, when you have two independent pieces of wire labeled with the same "name", like the couple of short wires labeled "Vop+", it means the wires are connected together. People use this in order to not mess with a lot of long wires in the schematics.
Gazmon:
Can I substitute the LM741 for an LM358
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