Kits and Parts dot Com
Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists

Quotes & Ordering
Customer Portal
Trimmer Capacitors
NPO Disc Capacitors
Polystyrene Capacitors
Silvered Mica Capacitors
Crystals - Matched
W3NQN Filters
WA2EBY ToroidKit
Variable Inductors
Magnet Wire
Integrated Circuits
Jacks & Plugs
Transistors & Fets
Misc Parts
Organic 5Watter Kits
Transceivers for 17,20,30,40 Meters
Universal Receiver
1Watter-30m QRPp Xcvr
1Watter-160m QRPp Xcvr
Retired Kits
Build this Universal Gilbert Cell Audio Detector

SA612AN PDF Spec Sheet
This kit is a very typical NE602 audio detector mixer circuit.
It includes a MUTE circuit consisting of Q1 and Q2.
Q1 is shown as a J201 but may be sub'ed as a J113
A positive voltage on the +MUTE signal line opens the audio signal path.
BFO oscillator injection is from a fundamental crystal tuned
via C5 or from an external BFO.
The 5.068 crystal is included.
C1 is now a 33uF cap. Note polarity when installing.
C2 & C10 are 330uF caps
C3 & C6 may be replaced with 47n capacitors
C9 has a 2.5 mm lead spacing; form leads to fit 5 mm holes

Toroids, Ferrites