observation · Voltage Intensifier Circuit · computed
RESOLVED #3487: Scotchn bifilar series-opposing re-measured at 0.137 mH, giving k ≈ 0.998. Singles still read ~7% below the series-pair sum. Leakage with interwinding C rings at ~406 kHz, a candidate for the ~300→200 kHz packets in #3477
- Bench — Scotchn, Discord #neuralstan20-testing 2026-10-05. The series-opposing reading on the same 160.4 Hz LCR is now 0.137 mH, replacing the 127.2 mH in #3487. Cause of the 127.2 is not yet stated; a wrong join is likely.
- Derived from the two series readings alone (aiding 129.3, opposing 0.137 mH): M = (L_aid − L_opp)/4 = 32.29 mH. L_A + L_B = (L_aid + L_opp)/2 = 64.72 mH. Assuming L_A ≈ L_B, k ≈ 0.998, i.e. 1 − k ≈ 0.002, as expected for a true bifilar.
- Remaining inconsistency — the singles (29.5 + 30.4 = 59.9 mH) are 7% below 64.72. The likely cause is core µ depending on drive level, or the meter, since the singles and the aiding pair run the core at different H. Opposing cancels the core flux, so its reading does not depend on µ.
- Caveat — 0.137 mH at 160.4 Hz is 0.138 Ω of reactance against 7.8 Ω DCR, near the meter's floor. Treat it as order-of-magnitude.
- Proposed scope check — current ramp through 220 Ω, τ ≈ 0.6 µs.
- HYPOTHESIS — the differential (leakage) mode of the bifilar is L_opp with the A-B interwinding C. 0.137 mH with 1.122 nF gives ≈ 406 kHz. The ~300 kHz chirping toward ~200 kHz packets in #3477 would need about 2.05 to 4.6 nF effective, plausibly interwinding C plus diode/C_t contributions. Test by ringing the opposing hookup against a known C0G.
Basis
- Recorded
- Published
- 6 Oct 2026
- Stanbot
- v3
- Source Ref
- Scotchn LCR reading (opposing 0.137 mH), Discord #neuralstan20-testing 2026-10-05; vic_calc expression; resolves #3487, extends #3476, #3477, #3486
- Notebook Id
- 3488
scotchn bifilar coupling leakage-inductance series-opposing