eve , da se ne ponavljam
http://www.diyaudio.com/forums/pass-labs/293169-whats-wrong-kiss-boy-5.html#post4890102
.......... easy peasy
let's call them Iron Pre and Iron Pumpkin . Iron Pre is for DiyA Store :
relay selector - usual pot - JFet buffer - jensen output autoformer , one shunt reg on board (called Good Gemini)
goes in two flavors - SE and Bal ; in both iterations one Jensen per channel , difference being - connected as usual autoformer for SE , and as (SUSY , tnx to Papa) differential/balanced/whatever for Bal
SE is one stereo pcb
BAl is one mono pcb , so two needed for stereo trambolinity:
on both you can toss ordinary pot (short adequate pads on pcb) and instead of Jensen - connect on his pads AVC** of your liking (maybe with ZM's help to decipher proper connection for you)
**(for SE iteration you can choose AVC of your liking , several of them on market , mine hopefully soon too
for Balanced iteration you need Balanced AVC , choose one of your liking , few of them on market , mine hopefully soon too )
mains xformer - secondary 36Vac CT 10VA is minimum , either one per channel of common for both
piccolo heatsinks on Good Gemini
now , Iron Pumpkin
relay selector - Diamond Buffer - AVC connected with gain (you choose tap - anything between 0db and 7.5db (let's just say that I'm declaring 7.5db less optimal vs. smaller ones)
shunt reg on board ,same as in Iron Pre
goes in two flavors - SE and Bal
both as mono pcbs , due to bloody number of parts in DB , comparing to elegant and simple JFet buffer
schematic and all habla would be published , but my pcbs stays in my domain
for SE iteration you can choose AVC of your liking , several of them on market , mine hopefully soon too
for Balanced iteration you need Balanced AVC , choose one of your liking , few of them on market , mine hopefully soon too trambolinity:
you can connect ordinary pot in front of buffer (two pads strategically on pcb,cut trace between them) and wire Jensen (or any other brand of adequate) autoformer in place of AVC
mains xformer - secondary 48Vac CT (minimum 36Vac CT) , 10VA as minimum when using one per channel , double that when using one for both channels
not so piccolo heatsinks on Good Gemini
applies to both Irons :
for explanation of function of two additional relays on Bal pcb , read one of previous posts ...... #199 ..................
................... (almost) forgot, re trambolinity , for all iterations:
you can skip entirely gain xformer/AVC (also additional relays on Bal) , leave/put plain pot in , use it as jolly good buffer pre ............................