Replication of Parallel wire or bifilar coil experiment

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  • Last Post 4 weeks ago
cd_sharp posted this 04 August 2021

Hey, guys

I'll try to investigate the old experiment from here . I'm going to use these POCs as the parallel wires:

POC1 (spool a little cracked and glued):
Layer 1: 16.5 cm x 40 turns
Layer 2: 17 cm x 39 turns
Layer 3: 17.3 cm x 39 turns
Layer 4: 17.6 cm x 39 turns

Total
157 turns, 26.841m


POC2
Layer 1: 16.5 cm x 39 turns
Layer 2: 17 cm x 41 turns
Layer 3: 17.3 cm x 40 turns
Layer 4: 17.6 cm x 38 turns


Total

158 turns, 27.013m

 

I'll be back with measurements.

Stay strong!

"It's just the knowledge of the coils and how they interact with each other" (Steven Mark)

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cd_sharp posted this 04 August 2021

Hey, guys

Air core measurements:

POC1:

L = 0.914mH (air core)
R = 0.990ohm

 

POC2:

L = 0.896mH (air core)
R = 0.980ohm

This shows a mistake somewhere, POC2 cannot be longer and have a smaller resistance. I counted something wrong. Checking..

Stay strong!

"It's just the knowledge of the coils and how they interact with each other" (Steven Mark)

cd_sharp posted this 04 August 2021

I found the error. I counted one turn more in the last layer of POC2. Updating the data:

POC1 (spool a little cracked and glued)
Layer 1: 16.5 cm x 40 turns
Layer 2: 17 cm x 39 turns
Layer 3: 17.3 cm x 39 turns
Layer 4: 17.6 cm x 39 turns

157 turns, 26.841m

L = 0.913mH (air core)
R = 0.990ohm

POC2
Layer 1: 16.5 cm x 39 turns
Layer 2: 17 cm x 41 turns
Layer 3: 17.3 cm x 40 turns
Layer 4: 17.6 cm x 37 turns

157 turns, 26.837m

L = 0.896mH (air core)
R = 0.980ohm

"It's just the knowledge of the coils and how they interact with each other" (Steven Mark)

cd_sharp posted this 04 August 2021

Next, self-resonance frequency for air-core.

POC1:

fRes = 373.6KHz (air core), Vin = 2.5V AC, Vout = 6.72AC

This results in a calculated value of interwinding capacitance:

Interwinding Capacitance = 0.1987nF


POC2:

fRes = 397.5KHz (air core), Vin = 2.5V AC, Vout = 7.44AC
Interwinding Capacitance = 0.1789nF


This value is strictly about the capacitance between the turns since I measured it without a core. The Metglas core adds some capacitance and affects the self resonance frequency. Also, any coil added to the core affects the self resonance frequency of any existing coil on the same core. But those do not modify the interwinding capacitance. So, my guess is I need to avoid those numbers. Don Smith is talking about the fact that a coil loads and unloads based on it's inductance and capacitance as a "piece of wire". He's not mentioning the core.

The numbers above should be worthy of my attention. I'll keep the ones I will take while mounted on the core just for information.

Stay strong!

"It's just the knowledge of the coils and how they interact with each other" (Steven Mark)

cd_sharp posted this 05 August 2021

Hey, guys

Antenna properties for POC1:

26.841m results in frequency 5.327669 MHz.

Using harmonic 1024:

5327669 / 1024 = 5202.8 Hz is the target resonance frequency for POC1.

 

For the input coil:

Using harmonic 256:

5327669 / 256 = 20811.2 Hz is the target resonance frequency for the input coil.

Wire length: 26.841 / 4 = 6.71m

But there is another issue related to the input coil. The impedance needs to be well in the range of the Sound amplifier I'll be using. 2, 4 or 8 ohms are mean load values, so the impedance of the input coil cannot go very much higher than tens of ohms.

Stay strong!

"It's just the knowledge of the coils and how they interact with each other" (Steven Mark)

cd_sharp posted this 4 weeks ago

Hey, guys

My latest progress, it's not much, but it's a step forward. Stay strong!

"It's just the knowledge of the coils and how they interact with each other" (Steven Mark)

Chris posted this 4 weeks ago

Hey CD,

Excellent Thinking and Excellent Work!

If I may, Load both POC's the same, use a Diode and a Light the same ratings. At resonance, you will see the Input come down also. Input comes down for many reasons, the main reason is the Input Coils Impedance changes, is different compared to a Conventional Transformer, it is not loaded at Resonance.

Excellent work My Friend!

Best Wishes,

   Chris

 

P.S: Don't forget the Work and Regauge Regions. They need to be Linear:

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