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Recent content by trastikata

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    2 e-i transformers to one e-e transformer

    Hi, I don't want to sound rude, but I think my question is quite specific - the addition of the "I-elements" with the purpose of equalization of the core sizes as presented on the drawing. The other "things involved", like transformer power and winding calculation, are not what I am asking an...
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    Nichrome Wire Circuit

    12v / 5A = 2.4 Ohms and you are connecting 2.2 Ohms load, so you are trying to draw more current than what the supply is capable of delivering. The strip is rated 2.2 Ohms but at what temperature? Also did you measure the resistance to confirm the value? That 4.6 Ohm resistor in series is...
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    2 e-i transformers to one e-e transformer

    Hi, I have two E-I MOTs with slightly different sizes of the magnetic cores and I would like to rewind them to a single E-E transformer. Thus my question is - given the difference in the sizes, would it help if I vertically add the "I"-parts to bring the both cores to the same dimensions -...
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    PIC18F and PWM problem

    I see what you mean, thanks a lot.
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    PIC18F and PWM problem

    Thank you Brian. The first thing I tested was to see if the PIC is resetting by using another pin held high - the PIC is not resetting. Also the watchdog is disabled. What I find strange is that increasing the PWM frequency over 500kHz (lowering the PR2 value below 12) removes the issue -...
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    PIC18F and PWM problem

    Hi, I am trying to implement a PWM on a PIC18F6585. After setting up the PWM registers I get to control the PWM Period and PWM Duty Cycle successfully. 'PWM_SETUP TRISC.2 = 1 'Configure P1A as input PR2 = 12 'Set PWM period to 2 uS / 500kHz CCP1CON =...
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    [SOLVED] P-channel fet driver problem

    Thank you indeed that was the problem. I drew the PCB using the wrong model - 2N2222A instead of MMBT2N2222A - looks like their collector-emitter pins are switched. Anyway, the TIP122-TIP127 are darlington pair transistors and now the circuit works exactly as in the simulation and drives the...
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    [SOLVED] P-channel fet driver problem

    Hello, I am trying to figure it out why the following circuit is not working properly in reality while in theory should work. It is a P-CHANNEL FET driver shifting the gate voltage within the limits of the MOSFET. The input (R39) is a 5v control signal and in my simulation at R37 it should...
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    Proteus - How to speed up zone regeneration?

    Hello, I am working on a large PCB with lots of traces and copper fill as ground plane. My PC has an 8-core AMD at 4GHz, 16GB RAM and fast NVIDIA GPU. In the display options I am using hardware acceleration. Problem: - Every time I move a trace or make a change affecting the plane, the entire...
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    Pulse Peak Track Hold And Reste circuit

    Thank you, much appreciate your feedback and help! - lowered the input capacitor value as you suggested. - missed the fact that the comparator is an open drain - I eliminated the FET switches. - did not have an appropriate OPAMP model for simulation, thus I used this. The actual OPAMP will...
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    Pulse Peak Track Hold And Reste circuit

    Thank you for your suggestions Klaus. My question is - is there a principal error in the analogue design that I miss and could cause problems?
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    Pulse Peak Track Hold And Reste circuit

    Pulse Peak Track Hold And Reset circuit Hello, I want to measure the peak value of short pulses (close to Gaussian form and about 0.5 - 1 usec duration) spaced at least 50 - 100 usec from each other. I came up with the attached circuit where the first amplifier tracks the peak value and the...
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    [SOLVED] Buffering negative voltage through OPAMP?

    Thank you for your help barry but I don't know how to. Does the potential difference between the supply terminals (18v vs 9v) affect the "stability" of the output with regards to fluctuations in the supply?
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    [SOLVED] Buffering negative voltage through OPAMP?

    Hello, I am buffering a -5v reference with an OPAMP and I have a split power supply +9v and -9v, referenced to ground. So I was wondering if in this case it would make any difference if the positive supply (V+) of the OPAMP is connected either to +9v or to GND while the negative supply (V-) is...
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    [SOLVED] 16x2 LCD - 3.3v modification IC?

    Hi, I have some 16x2 LCDs and want to modify few of them to 3.3v specifications. The only difference between the 5v and the 3.3v version is the missing U3, C1, C2 and disconnected J1. So any idea what U3 as indicated on the picture might be? Thanks - - - Updated - - - Ok, found it - U3 is...

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