Custom Coils: Detailed Company Information & Corporate Profile

Summary

Custom Coils was founded in 1967 and operates out of Alcester, South Dakota. As an independent electronics fabrication firm, it delivers a broad array of transformer solutions tailored to diverse industry needs.

Products include high‑voltage, switch‑mode, fly‑back, antenna and air coils, DC igniters, hydrogen, control, inverter, low‑profile, ferrite, pulse, single‑phase, specialty, isolation, surface‑mount, toroidal transformers and power or air‑core inductors.

The company employs between 100 and 200 staff members and reports annual revenues in the $10 million to $50 million range. It is classified under SIC code 3690 and serves customers primarily within the South Dakota Metropolitan Area.

Key personnel include owner Van Larson, purchasing manager Crystal Koppman, engineering sales director GT Stepp, and operator William Lizzette.

Custom Coils Website	customcoils.com
Social Links
Phone Number	605.934.2460
Industries	Electronics Fabrication
Custom Coils Headquarters Address	109 Iowa Street, Alcester, South Dakota, 57001 US
Company Size	100-200 employees
Specialities & Services	transformer, Custom transformer, Custom Inductor, High Voltage Transformer, Switch-Mode Transformer , Fly Back Transformer , Antenna & air coils , Dc Igniters , High current inductor , Hydrogen coils, Control Transformer, Inverter Transformer, Low Profile Transformer, Ferrite Transformer, Pulse Transformer, Single phase Transformer, Specialty Transformer, Isolation Transformer, Surface Mount Transformer, Toroidal Transformer, Power Inductors, Air Core Inductors
SIC Code	3690
DMA Code	South Dakota Metropolitan Area
Founded	1967
Estimated Annual Revenue	$10M - 50M
Operating Status	Independent Company
Updated:	2026-09-19