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Output transformers for DACs

For sale. $500. Active version of SE I/V board based on D60 1:18 trafos + buffer on the matched 2sk170V/2SJ74V jfet pairs. Stackable on to iancanada's DAC, but suitable with any other current output type DACs (TDA1541, PCM63, AD1865, etc...). Needs from +/- 12V to +/- 20V for operating (+/- 30mA).

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For sale. $500. Active version of SE I/V board based on D60 1:18 trafos + buffer on the matched 2sk170V/2SJ74V jfet pairs. Stackable on to iancanada's DAC, but suitable with any other current output type DACs (TDA1541, PCM63, AD1865, etc...). Needs from +/- 12V to +/- 20V for operating (+/- 30mA).

View attachment 1336580
Question pls is there a capacitor along the signal line ? Thks
 
Hi Ivan, I wonder if there is an easy way (not taking off the soldered Jfets) to change the active mode to passive mode for your new PCB? Thanks!
Hi.
Sure. There are two separate terminals for active and passive outputs. To use passive output simply do not apply PSUs for the active stage. Jfets are simply in parallel with the passive outputs (jfets input impedance is huge).
 
Hi.
Sure. There are two separate terminals for active and passive outputs. To use passive output simply do not apply PSUs for the active stage. Jfets are simply in parallel with the passive outputs (jfets input impedance is huge).
Thank you! That's great, I would like to try something alternative to Jfets here, lol.
BTW, how much DC the transformers can handle? I just built a 1541A board with DC offset (no capacitors at the output), it can have 2V+ DC when it gets powered on for a few seconds. Is it safe to use D60 here or some extra protection is needed... (sorry if I asked stupid questions here, have very limited knowledge and could worry about something nonsense)..