Interesting, where do you see an arrow?
I see, when you put the cursor on it, I never minded this.....hu hu
How can I change this direction of the arrow?
I see, when you put the cursor on it, I never minded this.....hu hu
How can I change this direction of the arrow?
Got it, turning the resistor for 180 degrees, I never took care of this before.... I thought a resistor is a neutral element for direction......
Many thanks lhquam! So I must care for the resistor orientation in future.
And I thought Spice would think more than me.....
:--))
Many thanks lhquam! So I must care for the resistor orientation in future.
And I thought Spice would think more than me.....
:--))
Attachments
Happy Easter guys!
This morning was looking around and noticed a nice biasing scheme from earlier work of Pa
This morning was looking around and noticed a nice biasing scheme from earlier work of Pa
It's the "dual" of the textbook circuit: emitter resistors in series, electrolytic capacitor from resistor midpoint to ground.
In both cases the idea is to create an impedance from emitter to ground, which is lower for AC signals than for pure DC. Thus the AC gain is set suitably high, without disturbing the DC bias point.
The "dual" flavor as implemented in the NS-10, allows the use of smaller electrolytic capacitors to get the same AC gain. Which was probably economically advantageous in 1978 when it was designed.
In both cases the idea is to create an impedance from emitter to ground, which is lower for AC signals than for pure DC. Thus the AC gain is set suitably high, without disturbing the DC bias point.
The "dual" flavor as implemented in the NS-10, allows the use of smaller electrolytic capacitors to get the same AC gain. Which was probably economically advantageous in 1978 when it was designed.
Hm, hm..... riddle of the day for beginners!
SIT-5 manual:
"we can trim the load line of the SIT so that it dominates the output character, adds a little to the output power, but mostly gives a consistent character across a population of SIT devices."
Desperate mind thinks:
This could lead to the consequence that the SIT contributes only 20%. and not the MosFet.
If we assume this, is then the condition "mostly gives a consistent character across a population of SIT devices." fulfilled.....?
:--))
SIT-5 manual:
"we can trim the load line of the SIT so that it dominates the output character, adds a little to the output power, but mostly gives a consistent character across a population of SIT devices."
Desperate mind thinks:
- can the SIT "dominate the output character" and at the same time "add a little to the output power" ?
- "across a population of SIT devices" We know that the THFs vary much in their data.
This could lead to the consequence that the SIT contributes only 20%. and not the MosFet.
If we assume this, is then the condition "mostly gives a consistent character across a population of SIT devices." fulfilled.....?
:--))
Maybe the 20% SIT contribution are responsible for the H2 dominance up to 30W simply, that could be meant by "dominates the output character"
and of course HAPPY EASTER TO ALL.
😍😍😍
and of course HAPPY EASTER TO ALL.
😍😍😍
Changing the load line usually entails changing operating points. I suggest changing the SIT Vds, increasing it so that the SIT dissipates more energy than the mosfet.
The nice thing is that it can be easily done in LTSpice. Give it a try. 🤓
The nice thing is that it can be easily done in LTSpice. Give it a try. 🤓
to give more nightmare to Generg if you use 4 /8 or 16ohm speaker is the H2 H3 ratio change of just the amount of distorsion ? 😎
though, with Pa, you always count on possibility of typos, slips or similar .......... non- or deliberate 
Papa's are funniest ways ......
Papa's are funniest ways ......
