Unable to get a Wien bridge oscillator to work

Click For Summary
SUMMARY

The discussion centers on troubleshooting a Wien bridge oscillator circuit that is not functioning as expected. Key issues identified include incorrect resistor placement, lack of a proper power supply connection, and the necessity for a dual power supply for the LM224 operational amplifier. Participants emphasized the importance of providing complete circuit schematics and component values for effective troubleshooting. Additionally, suggestions were made to utilize a filament lamp for amplitude stabilization and to consider alternative circuits for LED blinking applications.

PREREQUISITES
  • Understanding of Wien bridge oscillator design principles
  • Familiarity with operational amplifiers, specifically the LM224
  • Knowledge of circuit schematic drawing and component values
  • Basic electronics concepts, including power supply configurations
NEXT STEPS
  • Research the construction and operation of a Wien bridge oscillator using the LM224
  • Learn about amplitude stabilization techniques using filament lamps
  • Explore alternative LED blinking circuits using Schmitt trigger inverters like the CD40106B
  • Review detailed Wien bridge oscillator schematics from reputable sources, such as Analog Devices
USEFUL FOR

Electronics enthusiasts, hobbyists building oscillators, and engineers troubleshooting circuit designs, particularly those involving Wien bridge oscillators and operational amplifiers.

  • #31
1661143966001.png
 
Engineering news on Phys.org
  • #32
@Svein
I agree. The gate voltage control circuit of a FET can have a longer time constant than a filament globe, and that does reduce harmonic distortion at low frequencies.
 
  • #33
Baluncore said:
@Svein
I agree. The gate voltage control circuit of a FET can have a longer time constant than a filament globe, and that does reduce harmonic distortion at low frequencies.
Here's another FET-stabilized Wien bridge oscillator I designed for a pitch theremin, which is an electronic musical instrument:

https://www.theremin.us/Circuit_Library/wienbridge.htm

And here's another circuit I designed using two Wien bridge oscillators (to make a pitch theremin). In this circuit, operational transconductance amplifiers are the regulating elements:

file:///C:/Users/Arthur/Desktop/Theremins/203%20Theremin/203.html

I particularly like the second circuit, however, the operational transconductance amplifiers are generally only available as residual stock, and therefore not recommended for new designs.
 
  • #34
Art Harrison said:
And here's another circuit I designed using two Wien bridge oscillators
That link is to your C: hard drive.
 

Similar threads

How do I tell if the Wien bridge oscillator I built works
  • · Replies 7 ·
Replies
7
Views
4K
I have been unable to build a transformer
  • · Replies 17 ·
Replies
17
Views
3K
RC Phase Shift Oscillator not Oscillating
  • · Replies 41 ·
2
Replies
41
Views
7K
Purely passive RC Phase Shift Oscillator?
  • · Replies 27 ·
Replies
27
Views
3K
Differential Equation for a Wien Bridge Oscillator
  • · Replies 16 ·
Replies
16
Views
8K
Why Isn't My Raltron Crystal Oscillator Causing the Diode to Blink?
  • · Replies 17 ·
Replies
17
Views
2K
Charlieplexing: LEDs have different brightness
  • · Replies 14 ·
Replies
14
Views
2K
Basic Circuit: Why don't these two LEDs light up?
  • · Replies 9 ·
Replies
9
Views
2K
Building a Safe and Efficient Induction Heater Circuit: Tips and Tricks
  • · Replies 7 ·
Replies
7
Views
7K
Bridge Rectifiers: How Do They Work?
  • · Replies 6 ·
Replies
6
Views
3K