@jean-paul
But that's very exciting, I assumed for almost 40 years that the BC5xx form declared as low-noise is really the low-noise form /device. With the ZTX versions it is clear. Now you've given me a brain teaser. Ice_max 1A vs. 0.2A is one of the most striking fixed parameters. What are the main differences between the two PSPICE models?
thx
But that's very exciting, I assumed for almost 40 years that the BC5xx form declared as low-noise is really the low-noise form /device. With the ZTX versions it is clear. Now you've given me a brain teaser. Ice_max 1A vs. 0.2A is one of the most striking fixed parameters. What are the main differences between the two PSPICE models?
thx
My guess is that the base track resistors of both types differ significantly and that therefore, depending on the complex source impedance, sometimes the BC3x7 is the more advantageous choice.
Since “3/4 + 3/4” must be driven with low impedance, the input (in our case) will see approximately a 600Ohm source. In the original MF-A1 it is 3k3 ..! Thanks for the tip, CLG is less than 19dB (very strong negative feedback!), nothing should go wrong with the thermal noise.
Since “3/4 + 3/4” must be driven with low impedance, the input (in our case) will see approximately a 600Ohm source. In the original MF-A1 it is 3k3 ..! Thanks for the tip, CLG is less than 19dB (very strong negative feedback!), nothing should go wrong with the thermal noise.
Yes it are assumptions based on the datasheet but reality really is different. Or was different as it was measured long ago and AFAIK only those by Philips as these were good parts. Funny thing is that I still have the BC327/BC337 from that lot.
No idea about PSPICE. Never simulated anything and never will.
BC550C is worst as expected. Too bad BC560C was not tested. Still the preferred combo of many clever designers and this for decades. Some even proudly stating they used BC5xx "low noise" transistors 🙂
Audio is mainly consisting of assumptions backed up with nice graphs.
Audio is mainly consisting of assumptions backed up with nice graphs.
All the components are now in place, I just need free time.
But the drought is taking its toll on us; since mid-February, you'd think we were already in summer.
There is no rain!
But the drought is taking its toll on us; since mid-February, you'd think we were already in summer.
There is no rain!
