A problem encountered with medium-to-fast current-mode flyback switchers, when combining high-ratio multi-winding flyback inductors with...

A problem encountered with medium-to-fast current-mode flyback switchers, when combining high-ratio multi-winding flyback inductors with multipliers: When Q1 switches on, a large current surge flows as Cpump charges from Cmult1 via D2. At Q1, the surge magnitude is multiplied by the transformer ratio. On simulation, U1 senses this via Rs and cuts Q1 off instantly, crippling the switcher -- ...

We need a 25kV rms AC signal. OK, that's 70kV p-p. I had a 30kV Trek model 678 amplifier, a huge beast procured on eBay, but I fear it...

We need a 25kV rms AC signal. OK, that's 70kV p-p. I had a 30kV Trek model 678 amplifier, a huge beast procured on eBay, but I fear it was thrown away in a downsizing move, damn! With that we could make a 10kV rms AC signal, at a frequency of our choice. And maybe transform it up to 25kV. Years ago I made RIS-333 / RIS-470, a 10kV 600kHz amplifier / resonant-transformer for ...

This is a common type of jack with integrated magnetics http://www.kosmodrom.com.ua/pdf/HR911105A.pdf It connects the txf centre taps via...

This is a common type of jack with integrated magnetics http://www.kosmodrom.com.ua/pdf/HR911105A.pdf It connects the txf centre taps via 75R resistors to a 1000pf cap which then (pin 8) goes to the circuit ground. What does this do? There are versions of the 10/100 jack which don't use the centre taps at all e.g. http://peter-ftp.co.uk/screenshots/20191119201261014.jpg

I have seen a design for a high-power (200kW) AC motor controller that uses dual-inductor AC line chokes for a DC-DC converter for IGBT gate...

I have seen a design for a high-power (200kW) AC motor controller that uses dual-inductor AC line chokes for a DC-DC converter for IGBT gate drive power supplies. http://enginuitysystems.com/pix/electronics/200kW_AC_Controller_p3.png I have found some chokes rated 500 uH and 1 amp, with 250 VAC rated isolation, for less than a dollar each: http://www.mouser.com/ds/2/212/KEM_LF0016_SU9V-...

I have a switched mode power supply background and an looking at something like this for an old school audio amp...

I have a switched mode power supply background and an looking at something like this for an old school audio amp design. https://www.circuitstoday.com/push-pull-amplifier For SMPS pushpull we always used current mode control to assure the flux in the core does not walk all the way into saturation. Looking at these designs, none monitor or measure the current to assure the flux

I found old mosfet transistor IRF843, using 20k and 70k resistor, i manage to set the voltage at transistor gate to 3.9 volt and using 1uF to...

I found old mosfet transistor IRF843, using 20k and 70k resistor, i manage to set the voltage at transistor gate to 3.9 volt and using 1uF to channel the 27mhz rf signal to the transistor gate, i manage to get an audio from 8ohm speaker connected to the transistor drain. I'm using about 5.3 volt power supply from transformer. The audio is loud and clear. The mosfet gate can received

I am working on a simulation for a loop antenna in LTspice and I can't figure out why the signal strength features are what they are. The...

I am working on a simulation for a loop antenna in LTspice and I can't figure out why the signal strength features are what they are. The model uses a pair of loosely coupled inductors to model the transmitter and antenna loop with a separate pair of tightly coupled inductors to model the coupling transformer. A cap on the primary circuit is the tuning cap and a cap on the secondary is...

When using a gigabit ethernet PHY. Does it matter if one wires the magnetics with the "wrong" polarity like below ..? (reason being pcb routing,...

When using a gigabit ethernet PHY. Does it matter if one wires the magnetics with the "wrong" polarity like below ..? (reason being pcb routing, and the ethernet transformer isn't straightforward) From this: To this: RJ45 pin1 --- MX1+ ** TD1+ --- MDIA_P RJ45 pin1 --- MX1- ** TD1- --- MDIA_P RJ45 pin2 --- MX1- ** TD1- --- MDIA_N RJ45 pin2 --- MX1+ ** ...

Version 4 SHEET 1 880 680 WIRE 480 -32 384 -32 WIRE 608 -32 560 -32 WIRE 608 80 608 -32 WIRE 608 80 544 80 WIRE 656 80 608 80 WIRE 688 80...

Version 4 SHEET 1 880 680 WIRE 480 -32 384 -32 WIRE 608 -32 560 -32 WIRE 608 80 608 -32 WIRE 608 80 544 80 WIRE 656 80 608 80 WIRE 688 80 656 80 WIRE -112 96 -160 96 WIRE -64 96 -112 96 WIRE 48 96 16 96 WIRE 80 96 48 96 WIRE 240 96 192 96 WIRE 272 96 240 96 WIRE 384 96 384 -32 WIRE 384 96 336 96 WIRE 432 96 384 96 WIRE 480 96 432 96 WIRE -160 144 -160 96 WIRE 80 144 80 96 WIRE ...