# LC circuit Mutual Coupling

Discussion in 'Radio and Wireless' started by Rajinder, Dec 8, 2020.

1. ### Rajinder

526
9
Jan 30, 2016
Hi all,
I have a LC tank circuit connected to a base of a NPN transistor via a 10K resistor. The emitter is tied to 0V. The collector has a 10K load resistor tied to 5V.
The LC circuit has a resonance of 100KHz.
I want to mutually couple this circuit so that the transistor is switched.

How can I achieve this, could I drive the another LC circuit from a signal generator with a sine wave at 100KHz at say 1V? Then when they are in close proximity, I might see something?

Any help would be appreciated.

2. ### bertusModerator

1,680
651
Nov 8, 2019
Hello,

Is the LC tank connected to ground or the 5V?
Try to post a schematic.
You could use paint and the following sheet to create it:

Just copy from the sheet and paste it into your schematic and connect the parts with some lines.

Bertus

3. ### Rajinder

526
9
Jan 30, 2016
Its connected to OV on one side. The other side to the base of tge transistor via a 10K resistor.

526
9
Jan 30, 2016

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5. ### Rajinder

526
9
Jan 30, 2016
Hi
I have attached the schematic.
I suppose the pnp when on, will supply the voltage to the LC tank, i want to see what happens on the collector o/p.
Do I need another LC circuit (ss shown) to mutually couple?

6. ### Nanren888

469
135
Nov 8, 2015
Sorry, I am a little lost on what your aim is. Hence do not know which direction to suggest
.
Are you wanting to make an oscillator?
.
Do you want to detect the proximity of the other circuit from the mutual coupling with another circuit?

7. ### Rajinder

526
9
Jan 30, 2016
Hi, yes i want to check the detect the output of this circuit when it is mutually coupled to another LC circuit.
Any help would be aporeciated.

8. ### Nanren888

469
135
Nov 8, 2015
Yep that pretty much repeats what you said above, that I didn't undertand the motivation or purpose of.
I'll leave it to those smarter than I am.

9. ### Harald KappModeratorModerator

11,276
2,583
Nov 17, 2011
Always supply a schematic. It is so much more useful than words.

Rajinder likes this.
10. ### Rajinder

526
9
Jan 30, 2016
Hi, I have uploaded a schematic.