here is a diy of parts and pieces i had lying around...
on the left-2 channels of 1272 ,with fixed gain on both stages, 5k pad pot, oep's at the input,and some transformers i had to "hang" on the output,and take the output signal from the cap(collector of the output transistor)-
on the right -2 channels of 312,melcor diy,also with oep's ...,and a 12 position gain switch.
all of the outs are unbalanced (i run very short cables to the soundcard's inputs,and can always add output transformers if have the need for them).
also i made a small board for the mic input with pad,phase,and phantom.
power supply is one 0.5A transformer giving +24V,+48V,and +12V for the relays, and another 0.5A transformer giving +/- 18V for the api clones.
it was lots of work.....wiring,fitting things in place(trying to fit in those 4 small mic input boards was a challenge.....),drilling and all the other obvious stuff....But im very happy with the results
)
sound is grreat,no hum ,buzz,or anything like that,and some sweep tests i did with the audio tester showed good results...
i'll try to post samples when i'll have them.
oh, and i still have to do the instrument inputs wich i already drilled on the frontpanel....any sugestion on that one?how to interface Hi Z to the transformer's inputs?
thanks
on the left-2 channels of 1272 ,with fixed gain on both stages, 5k pad pot, oep's at the input,and some transformers i had to "hang" on the output,and take the output signal from the cap(collector of the output transistor)-
on the right -2 channels of 312,melcor diy,also with oep's ...,and a 12 position gain switch.
all of the outs are unbalanced (i run very short cables to the soundcard's inputs,and can always add output transformers if have the need for them).
also i made a small board for the mic input with pad,phase,and phantom.
power supply is one 0.5A transformer giving +24V,+48V,and +12V for the relays, and another 0.5A transformer giving +/- 18V for the api clones.
it was lots of work.....wiring,fitting things in place(trying to fit in those 4 small mic input boards was a challenge.....),drilling and all the other obvious stuff....But im very happy with the results
)sound is grreat,no hum ,buzz,or anything like that,and some sweep tests i did with the audio tester showed good results...
i'll try to post samples when i'll have them.
oh, and i still have to do the instrument inputs wich i already drilled on the frontpanel....any sugestion on that one?how to interface Hi Z to the transformer's inputs?
thanks
