Hi all, So I'd like to make a 300 V supply. I don't really want to start from the AC line. So I've been looking for a DC-DC converter...

Hi all, So I'd like to make a 300 V supply. I don't really want to start from the AC line. So I've been looking for a DC-DC converter solution. I started here, (of course) http://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf Figure 13 looked nice. I then priced a pico 32195 transformer. ~$100! Ouch! (maybe I can find a cheaper one.) I then was tr...

This http://www.panoramio.com/photo/61564837 might work for powering a thing I'm doing. I can use a standard cheap Coiltronix dual-coil...

This http://www.panoramio.com/photo/61564837 might work for powering a thing I'm doing. I can use a standard cheap Coiltronix dual-coil inductor as the transformer. The complementary emitter followers will have no shoot-through and can have controllably slow switching edges, since they will just follow the base drive. Anybody got ideas for the base driver device? Ideally it would be s...

One of my useless things I think I'll throw together. An audio amp. I have transformers, audio output transformers from a tube amp that have a...

One of my useless things I think I'll throw together. An audio amp. I have transformers, audio output transformers from a tube amp that have a certain feature I need for this. This is a mobile audio amplifier. The basic configuration is shown at the end of this post in Spice. The coils, L1 and L2 are actually a center tapped winding. What I want to know is how much power dare

I thought I could remove the secondary and the shunts, then install a new secondary and have a low voltage transformer, maybe not. I removed...

I thought I could remove the secondary and the shunts, then install a new secondary and have a low voltage transformer, maybe not. I removed the HV secondary, Then wound 10 turns and got 8 volts. I loaded it with 2 ohms, all is well except the PF is 0.15. I will need to have about 25 turns to get my 20 Volts, but, do I need to do something about the PF? Why is it so low? I expect Ph...

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent...

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent to transformer-couple the data, to avoid ground-loop common-mode hazards, and the obvious choice would be to use RJ45 connectors with built-in Ethernet magnetics. These seem to have inductance in the 400 uH range, which gives a low-end frequency response in t...

https://gizmodo.com/a-copper-shortage-is-likely-coming-for-the-energy-trans-1849178385 Motor and transformer design are pretty advanced. I...

https://gizmodo.com/a-copper-shortage-is-likely-coming-for-the-energy-trans-1849178385 Motor and transformer design are pretty advanced. I wonder if they could be made with more electronics and less copper somehow. Electrostatic motors miss by an enormous factor. As Africa and Asia advance and electrify, copper might be a limiting resource. Solar and wind power need a lot of copper for ...

I'm backing off of the neon sign transformer 12kV power supply. For the reasons I was told, the low frequency requires big capacitors. Also, I...

I'm backing off of the neon sign transformer 12kV power supply. For the reasons I was told, the low frequency requires big capacitors. Also, I ordered 20kV caps from Amazon and 6 of the 12 failed at under 4kV. I should have read the reviews, it is well shown these fail. So, I want a continuous DC voltage, I can imagine the old tripler design gave a decent continuous DC, but I'm look

I have the following simple converter: CD4093 drives the power logic shift register's NPIC6C596A OE pin with 500kHz square wave signal...

I have the following simple converter: CD4093 drives the power logic shift register's NPIC6C596A OE pin with 500kHz square wave signal with duty cycle 40%. Both chips are powered from 5V, the shift register is set to all ones. Hence I have 8 modulated open drain channels, everything works as expected. Now I connect a 1:1 transformer wound on a PC40 6mm toroid (AL=2300), 16 turns each. The p...

I'm simulating a flyback switcher and noticed that any K < 1 in the transformer radically slows down the sim, which is annoyingly...

I'm simulating a flyback switcher and noticed that any K < 1 in the transformer radically slows down the sim, which is annoyingly slow already... 90 seconds to sim 60 ms of startup and a little pulsed load blip. Maybe 6:1 slower with a little leakage inductance. So I only include leakage inductance to tweak the snubber. -- John Larkin Highland Technology, Inc picosecond

The Yamaha TX81Z, circa 1986: http://i254.photobucket.com/albums/hh102/gjm_photo/TX81Z1.jpg Big transformer, linear regulators, two-sided...

The Yamaha TX81Z, circa 1986: http://i254.photobucket.com/albums/hh102/gjm_photo/TX81Z1.jpg Big transformer, linear regulators, two-sided board, bunch of DIPs. Looks like the power switch is on the left at the back, and they've routed some long piece of metal around the regulator heatsinks all the way to the front panel. Anyone know why they'd do that? The ICs seem scattered all ov...

Murata makes some cool converters, with a ferrite toroid embedded in the PCB, with windings made of traces and...

Murata makes some cool converters, with a ferrite toroid embedded in the PCB, with windings made of traces and vias. https://www.dropbox.com/sh/lp9lb68pg3dohfa/AACLemXklO6JCdQRebMu1Vm6a?dl=0 Recom has some new parts, similar but they use a conventional wound transformer. https://www.dropbox.com/sh/thwbtq5mswzllg7/AACQQkqKd2XLj-MgWGonUd5Ia?dl=0 Both have standard footprints. The ...

We've used transmission-line transformers to drive mosfet gates. We've wound them from micro-coax on ferrite toroids, with the shield being...

We've used transmission-line transformers to drive mosfet gates. We've wound them from micro-coax on ferrite toroids, with the shield being the primary and the inner conductor the secondary. Sub-ns speed and low leakage inductance. But it's labor intensive. So I was thinking about doing it on a multilayer PCB, like a 6-layer. Layers 1/3/5 could be one to three layers of spiral trace, pr...

I have this graph showing the 'Z_Normalized sub i' vs the multiple of reactance to resistance needing transforming. I don't know what the...

I have this graph showing the 'Z_Normalized sub i' vs the multiple of reactance to resistance needing transforming. I don't know what the 'Z_Normalized sub i' means. Or, how I could use it to calculate input resistance, current, voltage or what I can do with it. Can someone explain it to me? > https://www.dropbox.com/s/fwfzwrjxg9e7ayo/4%20Times%20Rule%20Graph.png?dl=0          

Shows how the power transformer is directly wired to two separate boards. Not sure how, or why, they'd want to do that. Shows the...

Shows how the power transformer is directly wired to two separate boards. Not sure how, or why, they'd want to do that. Shows the hole through which the transistor has to be soldered. Note the two resistors in plastic tubing that have one end so

I want to make a DC-DC converter for 48 VDC to about 300 VDC at a = continuous=20 power of about 800W to drive a 1 to 2 HP three phase induction...

I want to make a DC-DC converter for 48 VDC to about 300 VDC at a = continuous=20 power of about 800W to drive a 1 to 2 HP three phase induction motor. I = have=20 some E55 cores and coilformers which should do the job, and also some=20 E47/20/15 which might work OK. The E55 is an Epcos type N27 and the E47 = is=20 probably the same. http://www.mouser.com/ds/2/136/e_47_20_16-75097.pdf h...

This is a multi-part message in MIME format. --------------FF67D67D34458B072894D837 Content-Type: text/plain; charset=utf-8;...

This is a multi-part message in MIME format. --------------FF67D67D34458B072894D837 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit So I'm doing a spin of my swoopy nanoamp photoreceiver board, to make it smaller and more versatile. The original QL01 has two pots, one for offset and one for HF boost. The HF boost is a lead-lag network that attenu...

I've just had a idea. Instead of tweaking the drive frequency to a Baxandall inverter, one could tweak the resonant frequency by switching in...

I've just had a idea. Instead of tweaking the drive frequency to a Baxandall inverter, one could tweak the resonant frequency by switching in extra capacitance with a PhotoFet. https://www.mouser.com/datasheet/2/149/h11f1m-185284.pdf Sadly. even the HF11 can only take 30V, so in Timo's inverter you'd need to add a extra 11 turn winding to his transformer and put the tuning capacito

Tariel Kapanadze[1], has invented a multi kilowatt free energy generator. Several different implementations are shown[2][3][4] In one such...

Tariel Kapanadze[1], has invented a multi kilowatt free energy generator. Several different implementations are shown[2][3][4] In one such contraption the components include a radiator buried in the ground, a wire to a water pipe, a Tesla coil/joule thief, a spark gap, transformer, capacitors, 5 ferrite cores from old TV HV transformers, and some other unidentified components.[4] On July...

There is a new-to-me power supply architecture, an H-bridge driving a load, but with the phases on the two sides slid around to...

There is a new-to-me power supply architecture, an H-bridge driving a load, but with the phases on the two sides slid around to control delivered power. TI does that in some chips, like UCC2895. I may have seen the architecture first in this ng. Anyhow, I was thinking about a high-voltage power supply with the phase-shifted bridge driving a series-resonant transformer. https://www.drop...

Hi, Since it seems a useful thing to have, I am making a wideband current probe, ~10-1000MHz, like one of these: Every home should...

Hi, Since it seems a useful thing to have, I am making a wideband current probe, ~10-1000MHz, like one of these: Every home should have one. It's from the article: 1) They suggest an electrostatic shield made from cop