Wien Bridge Oscillator AGC

110

01:21:50

Some weird AGC I quickly cooked together. Shake to start. 

published 6 years ago

lenzrulz

6 years ago

Thank you for sharing...👍🏻

kiani

6 years ago

Seem too much damping, the oscillation, is dropping slowly.

thebugger

6 years ago

In the beginning you can see it rise, and at some point (or if you shake the phone), you see it fall. This means that the circuit will sooner or later find a balanced point on which to settle the oscillations.

kiani

6 years ago

Leave iy running for 10 or 15 minutes, i think it will stop, i haven't tried.thoigh.

hurz

6 years ago

place a dummy source 150Hz even the target seems to be 100Hz the result is 153Hz. Anyway with dummy source and do NOT shake it does get a stable output after some ups and downs instable AGC action. Quite a lot effort for this result. But as buggzy said, quckliy cooked

thebugger

6 years ago

And in reality it is as simple enough as a lightbulb :D

hurz

6 years ago

at this place probaly not. Cuz a bulb is a PTC and this would increase the gain with increase of amplitude as collector resistor (gain is approx. Rc/Re) At the corrent place you can use any nonlinear component what a light bulb is, or a diode or a zener or a motor or just a nonlinear amplifier does not need any extra component. An OpAmp is to linear if its not clipping and needs an extra component to get soft nonlinearity. But this amplifier here is propably already nonlinear enough and does not need any extra component.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.