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Reverse charger protection
1. I have to give reverse charger protection for battery management system in which N-channel mosfets are in ground path.   2. Attached is the ckt for bq40z50 in which N-...
Friday, 12 August 2016 - 08:35
ASIC Charger IC for 1-4 loose NiMH charger
1. I am looking for ASIC charger IC for loose 1-4 loose NiMH cells. Looking for replacement for DS2714 in PCB.   2. Checked many products for NimH charger. All are for pack....
Wednesday, 27 July 2016 - 07:05
Charlieplexing led's on microcontroller/ Refresh rate
1. i have a micrcontroller whose all pins are used only 7 left & have to use 35 led's on it. SO i htought of using Charlieplexing.   2. Attached is the circuit. Its using...
Friday, 22 July 2016 - 06:38
PCB design cost calculations
What is most used practice for PCB design cost calculation. I have designed a 310 mm x 170 mm board. Below are specs: Total number of pins: 899 Pins in a net: 899 Not connected...
Sunday, 17 July 2016 - 15:21
Learn making android apps (Electronics)
I want to learn making android apps. I have some electonics applications like sending data on bluetooth & then displaying it in graph form. I have signed up here ( https://...
Monday, 4 July 2016 - 04:20
Suggestions required for small embedded computer
1. I need a camera interface which some audio output. Image taken has to be processed inside & its contents to be spoken out. Earlier I thought of using raspberry pi as it has...
Thursday, 23 June 2016 - 16:06
Zero cross using optocoupler 220vac
1. I have to detect zero cross using optocoupler of 185Vac-265Vac & 50Hz. Attached is the circuit. Have to feed the signal to MCU pin. Will make MCU pin to give interrupt on...
Tuesday, 14 June 2016 - 09:55
Could not turn on triac/ how to test it
1. I have attached a circuit in which triac is driven using MOC3021. Load is connected as shown in ckt attched . It is pure resistive load of 350mA. 2. Ac voltage is 220Vac,50Hz...
Wednesday, 8 June 2016 - 05:57
MCU reset when relay is on, dip in supply
I have to drive ac load through relay by micro controller. Problem is MCU reset as power dips when relay is on or off. Relay contact is 220Vac/50Hz. My circuit is follow:   1...
Tuesday, 17 May 2016 - 06:13
Vias size for heat transfer on copper pad on both layers
1. I have designed a circuit with 10A of current capacity. For large current I have made large copper track on both top & bottom layer. Now to connect both tracks, I have made...
Friday, 6 May 2016 - 03:09
DC - DC converter module, buck
I need three dc-dc modules which cah below specs: 1. Input: 12V-16.8V 2. Out1: 12V/5A 3. Out2: 12V/3A 4. Out3: 5V/2A I had looked into net & found that below dc-dc are ok:...
Tuesday, 26 April 2016 - 07:23
Few questions AT89C55WD, variant of 8051
I am using AT89C55WD, 40 pin DIP, in one of my project. I have connected 12Mhz crystal. It is 8051 variant. So inst time is 1us. Using Keil v4.72.9.0 & C compiler V9.50.0.0 1...
Thursday, 21 April 2016 - 09:43

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