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Hi,
For my application, Initial power on state LED should not glow, so that i have chosen PNP transistor.
Earlier i am also using PNP transistor for LED driver purose and i have connected Emitter point as VCC and its working fine.
But one reference circuit design mentioned (Option A) PNP...
Hi,
I need to drive LED by using PNP Transistor.
For that PNP Transistor - Emitter connect to VCC OR Collector connect to VCC?
Please find attached schematic for your reference
Please explain both method difference and when (which application) we need to use Emitter connect to VCC and...
Hi,
How to select and identify required cable gauge size (for Copper and Aluminium cable) with respect to current rating?
AWG std only mostly available in website. I need Cable sq.mm wise current rating chart.
for example:
45A 240VAC = Required Aluminium cable sq.mm? ( cable...
Hi,
Thank you for your suggestion,
Yes, I want to protect from inadvertent 230VAC
what voltage i need to set for LM431 Adj. zener for drive SCR (Crowbar circuit). It seems short circuit
- - - Updated - - -
HI,
Instead of crowbar circuit, can i use Bridge rectifier?
For inadvertent 230 VAC I...
Hi,
My device input voltage is 12 to 24VDC, for reverse voltage protection purpose I have provided series Diode in positive input point and SMBJ30CA TVS diode at across the input point.
Also I want to protect my device from 230VAC input.
Glass fuse provision available in input point
Please...
100W solar panel how much aH lead acid battery capacity require?
Hi,
We have 100W solar panel and need to connect with 12V lead acid battery. for that how much Ah battery capacity need to select?
Please provide suggestion
Thank You,
Rajan
Hi FvM,
Thank you for your support,
Please refer above comment No:4. we will check with choke or series resistors and let you know status.
For differential signal, SPI interface need to change my design and PCB.
I try to resolve this issue with exist design (4 data GPIO interface logic)...
Hi,
Data signal we can drive from 3 to 5V level and its working fine with 3.3V data signal.
while power on nearby load, that time only LCD display character goes to junk character.
Thanks
Rajan
Dear Klaus,
For your information,
For testing purpose I connected LCD directly to the CPU FRC connector point (bypassed FRC cable). but same issue is occurring after some time.
As you said we will try with series resistor.
Thank you for your support.
Rajan
Hi,
We are using 2x16 Character LCD as 4 data control (GPIO) option and its working fine.
LCD VCC is 5V and control 4 data line signal is 3.3V logic from MCU.
LCD placed at handheld device, through GPIO from MCU. we have used 0.5 meter ribbon cable from MCU unit and its working fine.
But...
Hi,
We were using Electret condenser microphone for voice call project.
By mistake Mic. signal wire connected as reverse polarity (+ & -) and put it ON for few hours.
Does it affect Mic. quality or damage Mic.?
Please suggest
Thank You'
Rajan
Hi,
Thank you for your support,
While testing energy(kWh) in low & high level frequency input. Energy accuracy should maintain ±0.8.
But accuracy value going out of range
Thanks
Rajan
Hi,
We were using ADE7878 for three phase meter application.
Meter working fine in 50Hz frequency. But at low & high range levels facing out of accuracy.
Please provide your suggstion
Thank you,
Rajan
Hi Audioguru,
Thank you for your clarification,
As per the attachment in post# 27, my Audio channel source provide Headphone GND separately and Analog audio GND separately. Can I consider it as a differential signal?
As per your input, I have modified the circuit with differential input...
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