Monday, December 12, 2016
JFET regen short wave receiver
I finally decided on short wave receiver to build. This is it.
This one uses J310s. I will be using J112s. I made tested circuits using 2SK193 and J176 JFETs. I expect the performance to be better with the J112s. The SPICE circuits seems to show better results with the J112s than the J176. I don't have a SPICE model for the 2SK193 so I will have to test them side by side. The J112 is a 'modern' transistor made for the auto industry which is readily available. My first hit on Ebay was 20 for $5.25. There may be better offers on Ebay I looked no further. Arrow Electronics sells them for 5.6 cents each. The catch is you must order in 1000 increments. The 2SK669 are 2 cents each. Still $20 a thousand isn't bad. My plan is to build with parts which are readily available so I'll be using diode and\or slug tuning.
Posted by Reset at 11:41 AM