Questions tagged [voltage-controlled-resistor]

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4
votes
3answers
160 views

How can I realize this nonlinear resistor?

I want to know if it's possible to realize a circuit described by the equation $$I = \sin(w V)$$ where \$I\$ is the current, \$V\$ the potential and \$w\$ a variable which characterizes the single ...
0
votes
0answers
59 views

Simple amplitude modulation of a square wave oscillator

I'm in the process of creating a classwide project for an introduction to op-amp and transistors. My goal is to create a 49 keys synth that every students can contribute a small part, run test plan ...
0
votes
2answers
76 views

Single Element Voltage Reducer

Im building a project that does not involve any transformer. Without using any transformer, what elements or components (in the question mark above) can you use that can reduce the voltage from say ...
2
votes
0answers
75 views

NMOS bidirectional variable resistor: How to increase body diode barrier potential?

I want to use an NMOS as a variable input resistor to an inverting amplifier. The source is connected to virtual ground and the drain is connected to the input. I need to accomodate both positive and ...
1
vote
0answers
486 views

Power stage for VCR (Voltage Controlled Resistor)

I'm building a VCR (Voltage Controlled Resistor) using the LM13700 component. You can read more details on that here: Floating voltage-controlled resistor with LM13700: How does it work? The problem ...
6
votes
3answers
3k views

Floating voltage-controlled resistor with LM13700: How does it work?

1. The LM13700 The LM13700 is an Operational Transconductance Amplifier (https://en.wikipedia.org/wiki/Operational_transconductance_amplifier) converting a differential voltage into a current output. ...