[ARC5] Transistorized LM

[J Mcvey]

 You might have problems finding some of those fets.I used BF244b and J310 fets when I was transistorizing a R392. You could use a single dual gate mosfet for the mixer rather than the double fet shown.
   


    On Saturday, August 30, 2025 at 04:42:05 PM EDT, Brooke via ARC5 <arc5 at mailman.qth.net> wrote:  
 
  Hi Ken:
 
 Thanks.  Here's some links:
 
 https://archive.org/details/73-magazine-1971-05/page/60/mode/1up
 https://ia600403.us.archive.org/6/items/73-magazine-1971-05/05_May_1971.pdf#page=61
 https://prc68.com/I/USM159.html#LM_18_Frequency_Meter
 -- 
Have Fun,

Brooke Clarke, N6GCE
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
 -------- Original Message --------
  
 73 magazine for May 1971 has an article on this, for those interested.

Entitled, "The Transistorized LM Freq Meter", starting on page 60.

I was recently given two, supposedly non-working, LMs. They don't look all that bad to me.

I'll see if I can make them work.

Ken W7EKB
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