yes its probly pushing it a bit, ah well...
the pot is a high quality ceremet sealed unit, so should last a while, the pot is the splitter, input goes to the wiper, one end of the res goes to inv opamp, other end of res goes to buffer opamp.
i only put it in to make sure of equal drive, and i had the pot left over from the same idea i had for running parrallel stk chipamps.
see you soon, steve.. ..
the pot is a high quality ceremet sealed unit, so should last a while, the pot is the splitter, input goes to the wiper, one end of the res goes to inv opamp, other end of res goes to buffer opamp.
i only put it in to make sure of equal drive, and i had the pot left over from the same idea i had for running parrallel stk chipamps.
see you soon, steve.. ..
Steve, you can actually remove the pot totally. It will be attenuating the signal very slightly (or a lot depending on the value of the pot and input resistors on your op-amps). Of course I'm assuming that you are simply driving a unity-gain buffer and a unity gain inverter... evn so, if you aren't you could convert them to unity gain easy. It really would be a better solution 
This thread here has the circuit:
http://www.diyaudio.com/forums/showthread.php?threadid=74183
C1 is the capacitor whose value might need changing to stop oscillations
http://www.diyaudio.com/forums/showthread.php?threadid=74183
C1 is the capacitor whose value might need changing to stop oscillations
richie00boy, yes i probly could do without the pot, the op amps are matched up to the drop through the pot, ie,, not unity, feedback is by 0.2% resisistors cutout from an old valve radio.
the idea was to set up with the pot then remove it once all the offset measurements had been done, but i never got round to it!!!
Consort, yes there is a small wheeze at power down, its very small and im not worried about damaging anything. when i ran the amps as single ended (not bridged into 6 ohm) they where quieter than a very quiet thing!!
thanks for the links, ill have a good look over the next few days.
see you soon guys, steve.. ..
the idea was to set up with the pot then remove it once all the offset measurements had been done, but i never got round to it!!!
Consort, yes there is a small wheeze at power down, its very small and im not worried about damaging anything. when i ran the amps as single ended (not bridged into 6 ohm) they where quieter than a very quiet thing!!
thanks for the links, ill have a good look over the next few days.
see you soon guys, steve.. ..
aniceto said:
This wellknown audio man
looks like have a lot of SENTEC stuff.
If you email him, he may send you a Sentec SCA1 diagram.
He has got SCA1 owner manual for free PDF download.
http://www.svalander.se/shoppen/sentec.htm
See also some hints by peranders in this post:
http://www.diyaudio.com/forums/showthread.php?postid=234058#post234058
good luck!
I was considering a darlington amp , but the cost of a real driver/ OP EF is the same , without the drawbacks. Not saying that a darlington can not sound good (most discrete HT receivers use them with IC front ends).
I have 4 pairs of the MN2488/MP1628 sankens that are free to anyone who wants them. For the circuits seen here they would be superior to the TIP's in every way.
OS
I have 4 pairs of the MN2488/MP1628 sankens that are free to anyone who wants them. For the circuits seen here they would be superior to the TIP's in every way.
OS
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