Forgot the name of this circuit (description inside)

  • Thread starter Thread starter DeeJayCruiser
  • Start date Start date
  • Tags Tags
    Circuit
AI Thread Summary
The discussed circuit involves measuring two resonant frequencies using an LM741 operational amplifier and two 555 timer ICs, one functioning as a metal detector and the other for resonance matching. It is suggested that the circuit operates as a mixer, producing an audible difference frequency when the outputs of the two oscillators, which operate above human hearing range, are combined. The circuit's purpose is to facilitate metal detection through frequency comparison. The original poster seeks clarification on the circuit's name, suspecting it may be related to an OP Amp differential amplifier. Overall, the conversation centers on identifying the circuit's function and name in the context of metal detection technology.
DeeJayCruiser
Messages
24
Reaction score
0
A circuit that measures two resonant frequencies and compares them with an LM741. One 555 is a metal detector with a coil of wire, and the other 555 is to be matched in resonance.

Any idea what the name of this circuit is? I thought it was an OP Amp differential amplifier, for metal detection, but as you can imagine double checking that on google is a little difficult
 
Engineering news on Phys.org
That would be a mixer.

The two oscillators produce an output above the limit of human hearing, but when the two mix, the difference frequency is audible.
 

Thread 'How might electronics be different if AC voltage was 72V at 45 Hz?'

Hey guys. I have a question related to electricity and alternating current. Say an alien fictional society developed electricity, and settled on a standard like 73V AC current at 46 Hz. How would appliances be designed, and what impact would the lower frequency and voltage have on transformers, wiring, TVs, computers, LEDs, motors, and heating, assuming the laws of physics and technology are the same as on Earth?
View full post »

Thread 'What happens if shielded cable has a short to the shield?'

While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
View full post »

Thread 'Why does the amperage go real high if there is a low voltage short?'

I used to be an HVAC technician. One time I had a service call in which there was no power to the thermostat. The thermostat did not have power because the fuse in the air handler was blown. The fuse in the air handler was blown because there was a low voltage short. The rubber coating on one of the thermostat wires was chewed off by a rodent. The exposed metal in the thermostat wire was touching the metal cabinet of the air handler. This was a low voltage short. This low voltage...
View full post »

Similar threads

Cabinet Alarm Circuit Design Using Op-Amp and Thyristor Technology
Replies
1
Views
3K
Any advice to make this Op-Amp temperature controller circuit work?
Replies
34
Views
4K
Understanding relationships in Induction Heating circuits
Replies
1
Views
3K
The Field Model of Energy Transfer in Actual Circuits
Replies
45
Views
7K
Solving OP Amp & EMI Problems - Joe's Experience
Replies
11
Views
5K
Engineering Analyzing the internal circuitry of IC 741 Op-Amp step by step
Replies
4
Views
5K
Newby Question on Inductive Sensor Coil Specs
Replies
2
Views
2K
Square Wave Frequency Doubler using Op-Amps
Replies
14
Views
11K
PLL with adjustable constant phase shift
Replies
1
Views
6K
Waveguides, cavities and circuits
Replies
5
Views
3K

Hot Threads

Recent Insights

Back
Top