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Hi,
I want to make an auto ranging uCurrent. The measured current goes through a 10 mOhm, 10 Ohm or 10k resistor. I want to be able to switch between these measurement resistor branches with a switching N-fet or something. so all these resistors are connected with each other in 1 point and the...
Hello,
In the past I developed some RF products but it was very hard develop a good RF product. The antenna didn't work good anymore when I put the product (with PCB antenna) in the housing. I used the RF explorer generator and spectrum analyzer to optimize antenna's (as a SNA). Now I want to...
The problem is that it has to be a voltage meter with a VERY high impedance, since the voltage source is from energy harvesting. I guess the max current is about 50pA (I know, that's very low).
Now I am using a OPA171 as an input buffer (Vin on the + input of the opamp). After this opamp is a resister divider that brings it into the ADC range. The OPA171 has an IIB of 15 pA. I am more than satisfied with that current, but I don't like it that I have to make an additional 36V DC voltage...
Hi,
Thanks for reading my message. I am making a high impedance measuring device that measures input voltage in the range of 0v up to 34V. Now I generate 36V for the input opamp and this first stage is a 1x buffer. Is there an opamp solution that only needs a single voltage supply (3v3) and...
Hi,
I have a problem with the automatic annotation of Altium (Tools|Annotate Schematics...). I want to group components with the same comment and footprint (100NF/0402, 220NF/0603 and 220NF/0402). Please see the steps in the attached pictures. Altium only does the 'order of processing' correct...
Hi,
Currently I am working on a buck boost calculator for the MC34063. Everything works, but there are a few things missing.
I want to calculate the input and output capacitor and I want to see the efficiency of the design.
Can you help?
Thanks in advance.
Hi,
Thanks for reading my message. I want to make an AM demodulator that demodulates up to 4 fixed frequencies. The AM demodulation frequencies are 83kHz, 200kHz, 455kHz and 800kHz. Please take a look at my schematic. The AM signal is passed through C1. Please tell me what input capacitor is...
I want to make my own design based on a current design. I need to know what diodes are being used on this reference board. Any help is appreciated. Thanks in advance.
Kind regards,
Erik
Hi,
Currently I am making a new design. In this design I will use 1 SPI port for 5 devices. I can connect each CS of the devices to a GPIO of the LPC1768 controller. Another option is to use a demultiplexer. The devices that may be attached to the SPI are placed on header (and I will keep the...
You are right if the capacitor is small or when the fan draws a large current. I tested circuit A on a bread board (SMD transistor on a test PCB) and it seems that the fan is a very small load (12V/0,1A). On the oscilloscope I saw a small increase in voltage when the PWM signal is high and a...
Hello,
I am wondering how to make a good PWM controlled heater output. I am using a N FET that is controlled by a push-pull configuration (12V/0V) and the N FET has a 100 Ohm resistor connected to the gate. The PWM is a CTOUT output from the State Configurable Timer of the LPC controller (PWM...
Altium designer annotation problems
Hi,
I am very happy with Altium designer, but with the old Altium DXP I didn't have any problems with annotating the schematic(s). Since Altium designer I have a problem with the Tools->Annotate Schematics option. I want to group the components with the same...
level-translator 3.3v 5v
This is my current solution. I had one unused 74HCT125 port in my application, so I use it for the level translator. I have a PNP transistor/N-FET solution (option 1) and a P-FET/N-FET solution(option 2). I am really concerned about power dissipation when switching for...
3.3v translator fet
Hello,
I want to translate a 3v3 logic signal to a 3v3 or 5v logic level (output voltage voltage of pcb is 3v3 or 5v). How can I make a cheap solution that can handle signals up to 16MHz? The signal may be inverted. Can I use a picogate? The picogate can be powered by 3v3...
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