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I have 3 "Emitter-Coupled" Oscillator, the difference is that I don't use a resistor on the tank circuit and I do vary the Inductor inductance. They're close on the PCB and they got some disturbs, if only one is running everythings is great, but if the others starts to oscillate, then everything got messed up. What can I do to fix this?
Everything got messed up: when more than 1 oscillator are working, their frequency isn't as stable as before, take for an example, running alone Osc 1: 110kHz, Osc2: 75kHz, Osc3: 45kHz, they oscilllate about 500Hz, but when more than 1 are working together, it seems like they frequency connect to each other.
I'm using this circuit as a "Metal Detector", so when I got some metal stuff near my inductor a LED should turn on, but when something get near to Ind from Osc1 if more than one is active, multiple leds will turn on.
My Oscilator are close, my inductors not much.
UPDATE: Tuned them on the same frequency, used 500ns on my oscilloscope and now my wave is looking like a hysteresis.
Edit:
Trying to clarify myself.
My board is 3 oscillators, like the one I said on first line, my tank circuit is capacitors, a coil 1:1 and a inductive loop, this one is kinda far from my board. I have them on a 8051 which I'm measuring their frequency and checking if there's a metal near.
About AC analysis I'm trying to do the things the way I know, I don't know much about oscillator nor Control theory, so I'm just observing things slowly. About the capacitor I can try, another notable thing is, a circuit like mine that works have 2 differences, their oscillators are far apart from each other and they use Neon Lamp to protect the loop while I use a bourne gas discharger. I read that gas discharge have a high capacitance, would that interfer this much?
Tried to couple each oscillater voltage supply(5V) using a 100nF ceramic capacitor, still the same problem.

I have 3 "Emitter-Coupled" Oscillator, the difference is that I don't use a resistor on the tank circuit and I do vary the Inductor inductance. They're close on the PCB and they got some disturbs, if only one is running everythings is great, but if the others starts to oscillate, then everything got messed up. What can I do to fix this?
Everything got messed up: when more than 1 oscillator are working, their frequency isn't as stable as before, take for an example, running alone Osc 1: 110kHz, Osc2: 75kHz, Osc3: 45kHz, they oscilllate about 500Hz, but when more than 1 are working together, it seems like they frequency connect to each other.
I'm using this circuit as a "Metal Detector", so when I got some metal stuff near my inductor a LED should turn on, but when something get near to Ind from Osc1 if more than one is active, multiple leds will turn on.
My Oscilator are close, my inductors not much.
UPDATE: Tuned them on the same frequency, used 500ns on my oscilloscope and now my wave is looking like a hysteresis.
Edit:
Trying to clarify myself.
My board is 3 oscillators, like the one I said on first line, my tank circuit is capacitors, a coil 1:1 and a inductive loop, this one is kinda far from my board. I have them on a 8051 which I'm measuring their frequency and checking if there's a metal near.
About AC analysis I'm trying to do the things the way I know, I don't know much about oscillator nor Control theory, so I'm just observing things slowly. About the capacitor I can try, another notable thing is, a circuit like mine that works have 2 differences, their oscillators are far apart from each other and they use Neon Lamp to protect the loop while I use a bourne gas discharger. I read that gas discharge have a high capacitance, would that interfer this much?
Tried to couple each oscillater voltage supply(5V) using a 100nF ceramic capacitor, still the same problem.
I guess I have a problem with the stored energy on inductor, how could I eliminate "odd" current, I mean eliminate the current that was brought by other oscillator or the metal messing up with the magnetic field? Also, tried using a 1M resistor parallel to LC Tank, nothing changed, should it be minor?

I have 3 "Emitter-Coupled" Oscillator, the difference is that I don't use a resistor on the tank circuit and I do vary the Inductor inductance. They're close on the PCB and they got some disturbs, if only one is running everythings is great, but if the others starts to oscillate, then everything got messed up. What can I do to fix this?
Everything got messed up: when more than 1 oscillator are working, their frequency isn't as stable as before, take for an example, running alone Osc 1: 110kHz, Osc2: 75kHz, Osc3: 45kHz, they oscilllate about 500Hz, but when more than 1 are working together, it seems like they frequency connect to each other.
I'm using this circuit as a "Metal Detector", so when I got some metal stuff near my inductor a LED should turn on, but when something get near to Ind from Osc1 if more than one is active, multiple leds will turn on.
My Oscilator are close, my inductors not much.
UPDATE: Tuned them on the same frequency, used 500ns on my oscilloscope and now my wave is looking like a hysteresis.
Edit:
Trying to clarify myself.
My board is 3 oscillators, like the one I said on first line, my tank circuit is capacitors, a coil 1:1 and a inductive loop, this one is kinda far from my board. I have them on a 8051 which I'm measuring their frequency and checking if there's a metal near.
About AC analysis I'm trying to do the things the way I know, I don't know much about oscillator nor Control theory, so I'm just observing things slowly. About the capacitor I can try, another notable thing is, a circuit like mine that works have 2 differences, their oscillators are far apart from each other and they use Neon Lamp to protect the loop while I use a bourne gas discharger. I read that gas discharge have a high capacitance, would that interfer this much?

I have 3 "Emitter-Coupled" Oscillator, the difference is that I don't use a resistor on the tank circuit and I do vary the Inductor inductance. They're close on the PCB and they got some disturbs, if only one is running everythings is great, but if the others starts to oscillate, then everything got messed up. What can I do to fix this?
Everything got messed up: when more than 1 oscillator are working, their frequency isn't as stable as before, take for an example, running alone Osc 1: 110kHz, Osc2: 75kHz, Osc3: 45kHz, they oscilllate about 500Hz, but when more than 1 are working together, it seems like they frequency connect to each other.
I'm using this circuit as a "Metal Detector", so when I got some metal stuff near my inductor a LED should turn on, but when something get near to Ind from Osc1 if more than one is active, multiple leds will turn on.
My Oscilator are close, my inductors not much.
UPDATE: Tuned them on the same frequency, used 500ns on my oscilloscope and now my wave is looking like a hysteresis.
Edit:
Trying to clarify myself.
My board is 3 oscillators, like the one I said on first line, my tank circuit is capacitors, a coil 1:1 and a inductive loop, this one is kinda far from my board. I have them on a 8051 which I'm measuring their frequency and checking if there's a metal near.
About AC analysis I'm trying to do the things the way I know, I don't know much about oscillator nor Control theory, so I'm just observing things slowly. About the capacitor I can try, another notable thing is, a circuit like mine that works have 2 differences, their oscillators are far apart from each other and they use Neon Lamp to protect the loop while I use a bourne gas discharger. I read that gas discharge have a high capacitance, would that interfer this much?
Tried to couple each oscillater voltage supply(5V) using a 100nF ceramic capacitor, still the same problem.

I have 3 "Emitter-Coupled" Oscillator, the difference is that I don't use a resistor on the tank circuit and I do vary the Inductor inductance. They're close on the PCB and they got some disturbs, if only one is running everythings is great, but if the others starts to oscillate, then everything got messed up. What can I do to fix this?
Everything got messed up: when more than 1 oscillator are working, their frequency isn't as stable as before, take for an example, running alone Osc 1: 110kHz, Osc2: 75kHz, Osc3: 45kHz, they oscilllate about 500Hz, but when more than 1 are working together, it seems like they frequency connect to each other.
I'm using this circuit as a "Metal Detector", so when I got some metal stuff near my inductor a LED should turn on, but when something get near to Ind from Osc1 if more than one is active, multiple leds will turn on.
My Oscilator are close, my inductors not much.
UPDATE: Tuned them on the same frequency, used 500ns on my oscilloscope and now my wave is looking like a hysteresis.

I have 3 "Emitter-Coupled" Oscillator, the difference is that I don't use a resistor on the tank circuit and I do vary the Inductor inductance. They're close on the PCB and they got some disturbs, if only one is running everythings is great, but if the others starts to oscillate, then everything got messed up. What can I do to fix this?
Everything got messed up: when more than 1 oscillator are working, their frequency isn't as stable as before, take for an example, running alone Osc 1: 110kHz, Osc2: 75kHz, Osc3: 45kHz, they oscilllate about 500Hz, but when more than 1 are working together, it seems like they frequency connect to each other.
I'm using this circuit as a "Metal Detector", so when I got some metal stuff near my inductor a LED should turn on, but when something get near to Ind from Osc1 if more than one is active, multiple leds will turn on.
My Oscilator are close, my inductors not much.
UPDATE: Tuned them on the same frequency, used 500ns on my oscilloscope and now my wave is looking like a hysteresis.
Edit:
Trying to clarify myself.
My board is 3 oscillators, like the one I said on first line, my tank circuit is capacitors, a coil 1:1 and a inductive loop, this one is kinda far from my board. I have them on a 8051 which I'm measuring their frequency and checking if there's a metal near.
About AC analysis I'm trying to do the things the way I know, I don't know much about oscillator nor Control theory, so I'm just observing things slowly. About the capacitor I can try, another notable thing is, a circuit like mine that works have 2 differences, their oscillators are far apart from each other and they use Neon Lamp to protect the loop while I use a bourne gas discharger. I read that gas discharge have a high capacitance, would that interfer this much?