Model Train Track detector Updated twin-t model train track detector circuit parts list?
Does anyone know what the parts are for this updated twin-t model train track detector circuit?
See Fig. 5-5 in "Easy to build Electronics Projects for Model Railroaders"I checked twice with the publisher for the missing parts list in the article but never got a reply.
C1 - ?? , C2 -??, D1-D6 - ??, D7 - ??
Q1,Q2 - TIP 142
R1 - ??, R2 - ??,R3 - ??