# Search:

Type: Posts; User: anotherbrick

Page 1 of 8 1

1. ## Thread: how to eliminate oscilation in current measuring circuit ?

by anotherbrick
Replies
4
Views
325

### Closed: Re: how to eliminate oscilation in current measuring circuit ?

I finally got rid of oscillations at Current Transformer amplifier output
I put baypass caps at Opamp power supply pins
and 100 pF caps between (-) and (out) pins

my scheme is a simple half...
2. ## Thread: how to eliminate oscilation in current measuring circuit ?

by anotherbrick
Replies
4
Views
325

### Closed: how to eliminate oscilation in current measuring circuit ?

hello dear forum

154027

I try to measure output current of 28 KHz half bridge inverter with current transformer
the 1. opamp amplify current transformer output 2. opamp pass only positive...
3. ## Thread: which switching pattern for DC brush motor ?

by anotherbrick
Replies
2
Views
258

### Closed: which switching pattern for DC brush motor ?

hello dear forum,

I drive a 24V dc brush motor with H bridge

153046

I use switching pattern 1 but this time the lower MOSs get hot, upper stay cold
can I use switching pattern 2 ?
what...
4. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: Re: how to match calculated and measured current of a brush DC motor ?

@Klaus @FvM

however I didnot take pencil and paper but I opened MS Excel :idea:
and calculated R_motor with FvM's formula
and it worked really

151461...
5. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: Re: how to match calculated and measured current of a brush DC motor ?

@FvM

//// Imot,avg = IDC,avg/D \\\\\

is there a webpage or book, where I can find this equation and theoretical explanation of this ?
6. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: Re: how to match calculated and measured current of a brush DC motor ?

@Klaus: I wait 3 seconds until circuit stabilize
the ACS circuit is at the input to the H bridge

@FvM:
there is an electrolytic capacitor parallel to H bridge C18 1000uF
U10 is ACS current...
7. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: Re: how to match calculated and measured current of a brush DC motor ?

0.141 duty

gates
151357

motor Voltage and current
151358

I have one question ; should not the current waveform be like this ?
8. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: Re: how to match calculated and measured current of a brush DC motor ?

I locked the rotor and give different duty and measured average , max and min motor current
I have 750 W transformer 220 / 24 V which I rectify and apply to circuit

I took 30 measurements in 100...
9. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: Re: how to match calculated and measured current of a brush DC motor ?

hello ,

gate signals of one leg ( the other leg Low MOS always ON )

151333

IR2183 driver has 500 ns deadtime

motor voltage and current waveforms (ACS sensor output)
10. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: Re: how to match calculated and measured current of a brush DC motor ?

hello ,

Where can I find the formulas for calculating the average current ?

my final goal is to find the speed of the motor from current measurement

thank you
11. ## Thread: how to match calculated and measured current of a brush DC motor ?

by anotherbrick
Replies
15
Views
940

### Closed: how to match calculated and measured current of a brush DC motor ?

hello dear forum,

I have a full bridge driving a 24 V DC brush motor

I have measured the max current of H bridge with ACS sensor with STM32 uC
and wrote down for four different duty of PWM
I...
12. ## Thread: Can I protect VDS of MOSFET with TVS diode ?

by anotherbrick
Replies
2
Views
346

### Closed: Can I protect VDS of MOSFET with TVS diode ?

hello dear forum,

I drive 24 V brush DC motor with H bridge - frequency is 10 Khz

the current can raise to 50 amperes

the VDS voltage rating of mosfets is 40 V

my question;
13. ## Thread: ramp generator question

by anotherbrick
Replies
5
Views
418

### Closed: Re: ramp generator question

hello thank you,

I dont want Vout exeeds Vin

Vout must be equal to Vin at the end of ramp

is it posible with integrator circuit ?
14. ## Thread: ramp generator question

by anotherbrick
Replies
5
Views
418

### Closed: ramp generator question

hello dear forum,

I want to design a ramp generator

here is my circuit and the simulation result

150130

my question ;
15. ## Thread: CO2 sensor recommendation ?

by anotherbrick
Replies
5
Views
714

### Closed: CO2 sensor recommendation ?

hello dear forum,

I want to measure CO2 in greenhouses

can you recommend a professional quality CO2 sensor ?

suited for this application

thank you
16. ## Thread: what is the best bus choice for inter-PCB communication ?

by anotherbrick
Replies
4
Views
735

### Closed: what is the best bus choice for inter-PCB communication ?

hello dear forum,

I have been asked to design modular I/O boards
for a PLC like device distributed to many small PCBs

the I/O modules will be unintelligent 4/4 digital I/O , 4/4 analog I/O ...
17. ## Thread: how to eliminate 50 Hz Power Supply noise ?

by anotherbrick
Replies
3
Views
412

### Closed: Re: how to eliminate 50 Hz Power Supply noise ?

after the diff. amplifier I must take the the envelope of this 100 KHz signal and amplify it again

is this posible with high pass filtering the diff. amplifier output ?
18. ## Thread: how to eliminate 50 Hz Power Supply noise ?

by anotherbrick
Replies
3
Views
412

### Closed: how to eliminate 50 Hz Power Supply noise ?

hello dear forum,

I am trying to amplify the difference of a 100 KHz signal signal from 2 identical coils

( I am trying to build a metal dedector - when metal enters the 1st coils inner , one...
19. ## Thread: Triac dimmer circuit firing parasitically

by anotherbrick
Replies
6
Views
685

### Closed: Re: help! - triac dimmer circuit firing parasiticaly

ultrasonic transducer is a capacitive device but I insert inductor in series
to operate it in resonance approximately

secondly if I remove the 0.2 uF capacitor it gets worser - more parasitic...
20. ## Thread: Triac dimmer circuit firing parasitically

by anotherbrick
Replies
6
Views
685

### Closed: help! - triac dimmer circuit firing parasiticaly

hello dear forum,

I try to build the following triac dimmer
which controls the power input to a 2 KW 28 KHz ultrasonic inverter

148563
148564

the ISIS circuit detects the zero crossing of...
21. ## Thread: which type of metal dedector circuit?

by anotherbrick
Replies
16
Views
2,617

### Closed: Re: which type of metal dedector circuit?

hello dear forum

here is the result of my PI metal dedector

as you can see in the video

it can dedect big metal parts but in...
22. ## Thread: which type of metal dedector circuit?

by anotherbrick
Replies
16
Views
2,617

### Closed: Re: which type of metal dedector circuit?

hello dear forum,

I assembled the 1st prototype of my puls induction metal dedector

as you can see in the video below ( only 1 min )it can dedect big parts but in the end of the video it cannot...
23. ## Thread: which type of metal dedector circuit?

by anotherbrick
Replies
16
Views
2,617

### Closed: Re: which type of metal dedector circuit?

"Uses CR coil for reliable detection and is cost effective for the examination of bulk material in gravity free-fall applications."

Low-cost triple-coil separator offers superior sensitivity,...
24. ## Thread: which type of metal dedector circuit?

by anotherbrick
Replies
16
Views
2,617

### Closed: Re: which type of metal dedector circuit?

I am trying to produce this dedector - what is your advice please? what type of dedector shall I use ?
...
25. ## Thread: which type of metal dedector circuit?

by anotherbrick
Replies
16
Views
2,617

### Closed: Re: which type of metal dedector circuit?

I dont want to detect the type of metal
I want remove the residual metal particles just like you mentioned

which type of detector is best for this job ?

thank you
Results 1 to 25 of 198
Page 1 of 8 1