Dear all,
I know little(nothing actually) of infrared heating. But i need to build a machine to solder surface mount electronic components. The purpose is to build a kind of tunnel with quartz infrared elements inside. The board will travel slowly inside the tunnel and the solder paste will be...
Hello,
I have some degree of experience in electronics, buy know very little about RF. I have 2 questions if you experts can help me.
I have on RF transceiver with 10mW output power and this antenna...
Hello,
I'm completly new to CE mark.My company is located in Europe, and I produce several electronic equipment, with maximum supply voltage of 24V DC. It falls under the EMC directive only, so I was told.
My questions:
Can I test my equipments in a non notified body, and do a self...
Hi experts,
I have the following RS485 network setup (2400bps):
Slave1 ---1.5Km----Master---300m---Slave2
I know that I must use 120 terminating resistors at
both ends. No problem, because the boards have jumpers
that can select the terminators.
But I must use bias as well (620 ohm resistor...
Hi,
I'm designing a LED matrix for Outdoor VMS of a considerable size (about 5meters).
There are about 16 matrix. From matrix to matrix are traveling signals, like clock, data out, latch enable etc.
What is the best circuit to amplify / regenerate signals? And about noise filtering (I did see...
Hi All,
I have a problem using (what I considered) a simple circuit.
I use a microcontroller that generates a PWM signal that feeds a gate of a N-channel Logic level MOSFET. When I switch the LOAD on and off (without PWM) the 5V (that powers the micro) is perfectly stable. When I use PWM to...
Hi,
1st, please excuse me if this is on the wrong forum.
I need speed detector to a costumer of mine. It needs to detect cars moving at speeds up to 200kmH in a highway.
I had found some im the market like Falcon-LC, but it costs about 500USD. Can anyone point me to a cheaper solution? It...
Hi all,
I need your opinion on a circuit:
I have 12 panels of 55 Leds each. Each panel is powered by 24 VDC (as internal limiting resistors. the total current is about 300mA). The 12 panels must be able to shwitch in sequence or all at the same time.
This is not a problem of course. The...
Hi all,
I want to build a simple loadcell amplifier with single supply. I had designed this circuit. Since I dont have that much experience, I will like to ear from you with more design experience.
The power supply will be 5 volt and the gain set to have a full scale of 4,096 volt (the...
Hi
I have the following setup:
Loadcell 20Kg 3mv/v
Excitation 5V (full scale is 15mv)
Load cell outputs to INA125P
Ina125P is providing the excitation voltage and is configured for a gain around 333 to give full scale at 5v (15mv x 333 = 4.99V).
I have 2 calibrated weights 0,459Kg and 1,150 kg...
Hi all,
I recently build a circuit using Logic Level P-Channel Mostefs to drive a 24V load from a microcontroller 0-5V level.
Gate to microcontroller, Drain to Load and source to 24V.
That dind't work. Works only at 5V. From 5V up the transistor is allways on. I think I need to use some kind...
Hi,
I need advice in designing a board for temperature measurement using PT100.
I know that I need a stable current generator (of about 1ma) to the PT100 and then read the voltage drop.
My questiom is: Do I need a current generator for each PT100, or can I use one of all the 8 ?
The current...
Hi,
I need a simple loadcell amplifier schematic for a project.
Loadcell is a 350R 4 wire bridge 3mv/V.
I need a fullscale output of around 5V.
I had tested the INA125P but I was very disappointed. I used the recommended circuit from BB in the application note, but the linearity was very poor...
Hi,
What determines if a Mosfet is logic level or not?
Is the VGS or the Gate Threshold Voltage?
For instance the IRF7314 from IRF as a VGS of +/-12V
and a Gate Threshold Voltage (minimum) of 0,7V. (maximum is not show on the datasheets)
This device is not advertise as logic level. But I...
Hi,
I'm currently researching to design a LED sign. This sign is to use outdoor and as 16x160 leds. The Led pitch is 12.7mm. I'm gonna use constant current LED drivers.
My only question is: Should I use multiplexed design or not? My first choice is to use multiplexed and pulse the LEDS at 80...
Hi,
I have to design a microcontroler circuit to operate inside a car (in these case a BUS). Do I have to be extra carefull in designing the power supply (5v) and protect the logic? I have seen some automotive designs with a lot of ferrites. Is really necessary or a standard approach is good...
Hi,
I have a basic question:
When I use as digital circuit to control a power Mosfet transistor (used as a switch) do I have to put a resistor in series with the mosfet gate or not?
Do circuits used others not. Wich is the bast practice?
How to calculate the resistor?
Thanks in advance...
