Monday, April 23, 2018

. . . 3x

sequential ½ to 2x per stage positive factor amplifier ::


? fast 1x to 1.77x amplifier -- i just try to get a grasp of these things . . .


another 200kHz cascadable "absolute" multiplier



[Eop]

Saturday, April 21, 2018

prev. follow up x2

modified known (but much likely a lot) simplified circuit


versus not so much slower but a lot more simple circuit



update :: 2018.04.21 -- about the poor performance of above . . .





[Eop]

Wednesday, April 18, 2018

prev. follow up

1 quadrant multiplier - divider -- exact but tending to unstable ??




[Eop]

Monday, April 16, 2018

examining a couple of web variable gain amplifier circuits

attenuating

the 0 to 34 mV  control voltage range sounds like a bit utopistic here
(everithing else looks good however)




amplifying/attenuating



2018.04.18 -- Update ::

bipolar v. of the previous


integrated analog multiplier substitute for VGA



[Eop]

Wednesday, April 4, 2018

theoretical experiment of 3 to 12 V boost converter

Simple , minimal ::

. . . with error as switch gets near constant 18mA to it's base due xa should be xi


however using cascade drive for switch poses problems -- also a good definition method for vc2 (LMx39/x93 OUTP)


some fixes -- no change . . . need to opt. the drive power usage


[Eop]

Wednesday, March 28, 2018

after getting enough of the shortcomings with the quadrature and the wien bridge

these ones are not much better . . . yet :

  • + the oscillation amplitude is determined
  • + the oscillation voltage range is defined (offsets)
  • – unfortunately avail. starting from above the 200Hz
  • + the fixed frequency can be set by RC






[Eop]

a couple of more 5V 32k osc.-s

a tuned (this time) j-Fet amplifier stage




[Eop]