Re: Variable power control

K9HZ <bill@...>

Yeah that works. 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ


Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois


Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it:

email:  bill@...


On Feb 21, 2018, at 12:48 PM, LKNDAVE via Groups.Io <novatronix@...> wrote:

THE ZENERS SET THE PASS VOLTAGE OF THE 100 VOLT 10 AMP DARLINGTON. sorry caps lock. they are 1 amp devices but the transistor slaves them to 10 amp handling. i have used this ciruit fo over 40 years. tayda has most of the parts, total like 5 bucks plus cheap shipping. read notes on schem. this is a 2 voltage control. my crappy software didnt have 4 position rotaries but most will get the idea. the transistor also has reverse emf diode built in.

Join to automatically receive all group messages.