No over-voltage protection ... no under-voltage lock-down ... no reverse polarity protection ... not built/tested in real life ... ::
555´s alternate ...
[Eop]
Tuesday, December 1, 2020
Thursday, November 26, 2020
The sensitivity test of some ideal diode circuits
... using the transistor model of the LM324 ... apx. down to 10% error
[Eop]
Saturday, November 21, 2020
Revised my LM321/358/324 transitor models
The best variant turned out to be (v.I) :
This v. is couple of times faster and with higher DC voltage gain than the actual LM324 , uses a different biasing circuitry and modified output stage . . . as it turned out it is difficult to get the ® d/s provided equivalent circuit to have the stability otherwise
. . . the 100Ω resistors seemed to improve the common mode rejection at the time they were added . . . however there has been modifications since -- at the moment there's no time to validate the effect for the final v. . . .
some tests :
. . . compared to the second best variant (v.JI) and to the macro-model of the Op Amp in question . . .
[Eop]
Monday, November 9, 2020
some audio power amp.-s
src :: http://ludens.cl/Electron/audioamps/AudioAmps.html
. . . much likely the NE/SA/SE 5534 ( --or-- not using the additional neg. supply as shown below ) significantly limits the otherwise available output power ?! . . . the above circuit however is claimed to have rather decent linearity (not the output power) . . .
▲ efficiency % 36.5% , P.OUT 370mW ▲
▼ efficiency : 27.6% , P.OUT 455mW ▼
Blah , blah , blah . . .
Dedicated iC-s ::
TAA300 / K174YH4 -- Left : Right -- 60.2% : 61.6% -- efficiency - power to 8Ω speaker (!! not to air)
P.OUT -- 810mW : 925mW
KA2201 : efficiency 58.1% , P.OUT 1.66W
Blah , blah , blah . . .
TDA2822 ::
!!! near ... realistic model : i set here the control current 3x of the one that results in near 6mA quiescent current -- that , in order to shift the upper bandwidth from below 10kHz to above the 20kHz ← which may not be the case for the real 2822 !!! -- efficiency 57.5% P.OUT 885mW
!!! simplified model : (likely behaves much better the real thing . . . + the supply range may be limitted at the low end !!!) -- (( !!! efficiency 87.3% !!! )) P.OUT 670mW
[Eop]
