Off-topic: this is resistor loaded single-ended and the efficiency can't be much over 8%.
A detailed analysis by "kvant" gives ~~8.58..%.
The 12.5% figure is cited many places, even (at least two) writers who should know better (or can rough it out as I did above).
This is not new. This result appeared in a letter in Wireless World from John Vanderkooy in 1969 (though he does not give the number):
http://www.americanradiohistory.com...1969-08-OCR-Page-0089.pdf#search="vanderkooy"
responding to-
http://www.americanradiohistory.com/Archive-Wireless-World/60s/Wireless-World-1969-06.pdf
Vanderkooy's critique of "CirCard" info:
http://www.americanradiohistory.com/Archive-Wireless-World/70s/Wireless-World-1973-12.pdf
page 78 of the PDF
disputes Carruthers et al, June 1973 page 79 of PDF
http://www.americanradiohistory.com/Archive-Wireless-World/70s/Wireless-World-1973-06.pdf
Between witch points you measure those 14V?
I'm have it connected here now, and can do measurements if you like.
Just tell me where 😺
Scotsky, check your diodes orientation.
E-153 should be with the cathode (ring) side looking towards NEGPWR.
In the PCB you sent me, they are marked the other way around.
That's why I think it blew both the diodes and the Darlingtons.
Also probably the reason bias remained at zero (Mosfets couldn't begin conducting?).
E-153 should be with the cathode (ring) side looking towards NEGPWR.
In the PCB you sent me, they are marked the other way around.
That's why I think it blew both the diodes and the Darlingtons.
Also probably the reason bias remained at zero (Mosfets couldn't begin conducting?).
Yes, I forget to mention them. Apologies again for that.
On the build, you can see that I soldered them in the correct way.
I must make an extra note of that, for eventually future builds.
What about the measurements, I thought you needed extra information, about different voltages on different places for reference.
I hope you'll get it soon right.
Yesterday evening I've used it with a proper build powersupply and pre-heated.
The the difference was great compared the first try's I made with a bad supply.
I totally forgot the time, when listening, so it was late last night 😹
On the build, you can see that I soldered them in the correct way.
I must make an extra note of that, for eventually future builds.
What about the measurements, I thought you needed extra information, about different voltages on different places for reference.
I hope you'll get it soon right.
Yesterday evening I've used it with a proper build powersupply and pre-heated.
The the difference was great compared the first try's I made with a bad supply.
I totally forgot the time, when listening, so it was late last night 😹
I am waiting for the Darlingtons and the E-153 diodes to arrive.
Just to make sure, I ordered the Mosfets as well.
As I stated in a previous post, the E-153 was soldered the other way around.
The cathode (ring) side of the diode was unfortunately not facing NEGPWR.
So my question is:
At power-up, would that be sufficient reason to blow the diodes themselves and/or the Darlingtons?
Just to make sure, I ordered the Mosfets as well.
As I stated in a previous post, the E-153 was soldered the other way around.
The cathode (ring) side of the diode was unfortunately not facing NEGPWR.
So my question is:
At power-up, would that be sufficient reason to blow the diodes themselves and/or the Darlingtons?
Folks, it seems this kit doesn't want to cooperate.
The reordered parts arrived (E-153 diodes, Darlingtons and the MOSFETs).
I placed the E-153 diode the correct way around but when I tried to fire it up, a wierd thing happened (again).
Using a typical LM337-based PSU to provide negative power (-22VDC), I got a drop of 10VDC across the Connection Points.
In the following picture, you can see the where exactly is connection point on the 'revised' schematic:
The X-marked parts to the left and to the right are left unpopulated.
Is it normal to measure a drop of around 10VDC (I measured -12VDC) right across the Connetion Points?
Thanks in advance!
PS:
The PCB has been thoroughly checked point by point and agrees with the original schematics.
The reordered parts arrived (E-153 diodes, Darlingtons and the MOSFETs).
I placed the E-153 diode the correct way around but when I tried to fire it up, a wierd thing happened (again).
Using a typical LM337-based PSU to provide negative power (-22VDC), I got a drop of 10VDC across the Connection Points.
In the following picture, you can see the where exactly is connection point on the 'revised' schematic:
The X-marked parts to the left and to the right are left unpopulated.
Is it normal to measure a drop of around 10VDC (I measured -12VDC) right across the Connetion Points?
Thanks in advance!
PS:
The PCB has been thoroughly checked point by point and agrees with the original schematics.
Because you used my PCB, I can send you high-res and more detailed pictures of mine if it helps?
(But I thought they were allready sharp enough.)
It works like a charm.
I only left out the L1, because I made a mistake with the powersupply and blew it, so, I shorted it.
How many current does the circuit use now?
But that wil be tomorrow.
(But I thought they were allready sharp enough.)
It works like a charm.
I only left out the L1, because I made a mistake with the powersupply and blew it, so, I shorted it.
How many current does the circuit use now?
But that wil be tomorrow.