FvM -

Today, 18:40

FvM replied to a thread BLDC: where is my BEMF? in Power Electronics

I didn't hear a reasoning for isolating rotor emf ("BEMF") in the measurement. The topic of the previous threads was slightly different, I think. ...

15 replies | 216 view(s)

Today, 16:06

FvM replied to a thread Transmitting audio over FM - help needed in Hobby Circuits and Small Projects Problems

The post leaves me helpless. No FM transmitter in the first schematic. Rohm BA1404 might be O.K., but the chip is obsolete, I think.

4 replies | 90 view(s)

Today, 15:43

FvM replied to a thread Contactor CA7-30 (Sprecher + Schuh brand) have 3 terminals coil ??? in Power Electronics

You'll notice that the coil specification isn't included in the shown type plate, neither coil voltage nor two windings option. I don't see a...

12 replies | 232 view(s)

Today, 15:20

FvM replied to a thread BLDC: where is my BEMF? in Power Electronics

The objective of the thread hasn't be told clearly. If it's estimating the actual rotor phase for sensorless control, detecting rotor emf zero...

15 replies | 216 view(s)

Today, 15:15

FvM replied to a thread How can I switch 1500V DC using Power Mosfets or IGBTs ? in Microcontrollers

You can buy multi kV HV switches using cascaded MOSFET with floating drivers from small specialized manufacturers, used e.g. in scientific...

2 replies | 46 view(s)

Today, 15:07

FvM replied to a thread Balanced OTA-C cascode IC design in Analog Integrated Circuit (IC) Design, Layout and Fabrication

The common CMFB amplifier is just a suggestion, reducing CMFB gain is another solution. Anyway, the three OTA are driving the same differential...

47 replies | 1660 view(s)

Today, 11:39

FvM replied to a thread Choosing the best FM demodulation technique in RF, Microwave, Antennas and Optics

I guess it is. If you worry about quadrature detector noise you don't need to consider simple pulse counting detectors. The general term noise...

5 replies | 219 view(s)

Today, 11:33

FvM replied to a thread Need help winding my own transformer in Analog Circuit Design

Referring to the initial post, current limiting by inductance doesn't occur with regular transformers, a special "high reactance" or "stray field"...

6 replies | 169 view(s)

Today, 11:20

FvM replied to a thread DIY smart phone cradle antenna in RF, Microwave, Antennas and Optics

Passive mobile phone antenna couplers are widely available as retail products, build into modern cars and also made as measurement and test...

4 replies | 184 view(s)

Today, 10:59

FvM replied to a thread Balanced OTA-C cascode IC design in Analog Integrated Circuit (IC) Design, Layout and Fabrication

CMFB is required for true differential OP and OTA to set the output common mode voltage to a defined level, usually mid supply. Without CMFB, the CM...

47 replies | 1660 view(s)

Today, 10:35

FvM replied to a thread Less than 2 connection and floating. please help in Software Problems, Hints and Reviews

Yes, the netlist doesn't belong to the schematic circuit. Please come back with consistent data. Even if you don't fully understand SPICE netlists,...

2 replies | 128 view(s)

Today, 10:18

FvM replied to a thread BLDC: where is my BEMF? in Power Electronics

A star configuration doesn't change the fact that the current in one winding is causing voltage drops in the others. But you'll get surely different...

15 replies | 216 view(s)

Today, 09:22

FvM replied to a thread How to get the formula of zero and pole in High-pass filter and low-pass filter? in Analog Circuit Design

You need to perform the circuit analysis exactly, copying formulas from a similar looking structure (miller capacitor) doesn't help. The present...

2 replies | 112 view(s)

Yesterday, 23:25

FvM replied to a thread Threshold settings using Pushwheel Switches in Elementary Electronic Questions

As there's no DAC with BCD input, you need decimal to binary encoding logic at least. If implemented by processor, PLD or huge discrete IC circuit is...

6 replies | 165 view(s)

Yesterday, 16:22

FvM replied to a thread problem with AC operating point analysis in Analog Integrated Circuit (IC) Design, Layout and Fabrication

See G1 in your schematic but not in gyrator.net

1 replies | 76 view(s)

Yesterday, 15:30

FvM replied to a thread Asking for help in my study field in Elementary Electronic Questions

You can expect help if you show some effort on your own. Tell what you already did, where you have problems in particular or which results do you...

1 replies | 81 view(s)

Yesterday, 15:21

FvM replied to a thread which processor are used for embedded linux? in Linux Software

Linux runs on processors, including larger FPGA with built-in processor (SoC FPGA) or soft processor cores programmed in HDL. You find suitable...

3 replies | 378 view(s)

Yesterday, 15:08

FvM replied to a thread CMOS active inductor gyrator question in Analog Integrated Circuit (IC) Design, Layout and Fabrication

Asking how to modify an existing circuit is an almost different question. You see that the straightforward approach in the linked paper utilizes a...

3 replies | 126 view(s)

Yesterday, 11:53

FvM replied to a thread Contactor CA7-30 (Sprecher + Schuh brand) have 3 terminals coil ??? in Power Electronics

Looking at the recent CA7 selection guide http://www.sprecherschuh.com/ecatalog/get/A/CA7_Contactors.pdf, it seems like the standard 24DC coil option...

12 replies | 232 view(s)

Yesterday, 11:32

FvM replied to a thread Flip fllop based touch on touch off switch in Hobby Circuits and Small Projects Problems

Yes, DFF with debounce definitely works. Here with an additional delayed "forced-off" function.

15 replies | 257 view(s)

Yesterday, 11:02

FvM replied to a thread Contactor CA7-30 (Sprecher + Schuh brand) have 3 terminals coil ??? in Power Electronics

Power consumption of the "pick-up" winding is actually specified as 200 W. It's only operated for a few 10 ms.

12 replies | 232 view(s)