10-09-2018, 05:59 PM
Hi everyone. Just a quick update as I have re-visited a module I made a while ago (before my TRF receiver) when I was inspired by Trevor's super-regen. Originally I got a little confused with it and did not get good results. Today I was modifying a crystal radio type coil / capacitor setup and decided to try it with my module. I just used a single turn using my hookup links for regenerative feedback. I still get a little confused as to what is happening, but on later checking I find that the tuning was over LW and MW as I received RTE Radio 1 and Caroline (plus one or two BBC stations) with excellent sound quality (with a bit of fiddling). I was using my long wire aerial (length of loft) and earth to hot water tank across the landing. I found that the setup gave good results so may well put together as a permanent unit at some point. The module uses a 1j29b in a fairly standard regen setup using a level pot on the screen grid. Perhaps the only difference to traditional circuits is my use of a transistor (driver?) transformer as output transformer to an external amplifier (I used my Germanium transistor based bench amp). The low tuning range is defined by my currently paralleling 2 x 500 pf capacitors. I may well change that, but it is perhaps unlikely that the tuned circuit I used will be permanently with the regenerative circuit.
Tracy
Tracy
