[ARC5] Solid-State BC-221

[Roy Morgan]

A 73 Magazine article about the LM appeared in 1971:

The Transistorized LM Frequency Meter
Charles Landahl W5SOT
73 Magazine
May 1971 Pg 60, ff.

The first step in this procedure is to smash the tubes.

Please don’t.

Roy

> On May 28, 2020, at 5:08 PM, Hubert Miller <kargo_cult at msn.com> wrote:
> 
> I had my water distiller appliance up on the table and taken apart for repair, and I wanted to have the hand - drawn schematic I'd drawn long ago, just to check if my schematic was accurate. To my surprise, I quickly found the schematic, which is untypical.
> But, in looking thru the paper file, I also found a couple articles:
> 
> "Solid - State BC-221 Frequency Meter";   QST magazine;  Feb. 1977 p 35, 36...
> "More on Solid - State Conversion of BC-221 / LM Frequency Meters";  QST Dec. 1979, p 59….

Roy Morgan
K1LKY since 1958
k1lky68 at gmail.com