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16f84a Programmer Circuit And

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Here's the circuit, as shown in fig1, There's Supply from adapter(9.5V DC), there's also a supply from the battery(8.4V Max). Diodes used(D1,D2) are shottky diodes, with a typical drop of (0.3V-0.5V). The problem i was facing was even though battery voltage at given point of time is less than Adapter Voltage(ADPT), At TP3, I was still getting batte
I have been digging through various forums and internet articles searching for a current sensing relay circuit that will activate a low voltage relay when the circuit senses a 120v machine drawing 5 or more amps of power. I have hand drawn a schematic and is attached. My desire is to activate a low (...)
I'm trying to design a self contained DC bus power supply. Specifically it's for a 400v 2200w AC servo drive. Trying to get this all down on 1 PCB for simplicity. I've been using this drive for some time with just 240v mains rectified to 340vDC and some filter caps. The inrush current on charging the caps from flat is rather large, Which for a whil
I am new on PCB Design. I want to learn, as I have no idea about how should I do my own designs, I am copying some existing ones .. So, I choose a Simple One, a Frequency Generator Module (XR-2206): 157392 The PCB Layout at the Top looks like this: 157393 and at the botton looks like th
Hi, Do you agree that the LLC converter would be more efficient for the above case? Consider synchronous rectifiers in each case. The Buck would be a Dual cascaded Buck so that Duty cycle was not too small?.also, the cascaded method means the downstream buck, that carried most current, can have a lower voltage mosfet with lower rds(on). Wha
On page 9 of the book ?Power supply design, Volume 1 Control? by Dr Ridley, he states that a Full Bridge converter is good for power levels from 200w to over 5000w. Most places where I have worked would usually say above 1000W means a resonant converter is really needed. If anything, it is said that this is because the noise of a hard switched c
what do we mean when we say "current adds up in phase"? For a wire antenna, there's already a current arises from feed source and it causes antenna to radiate, then why we emphasize 'adds up in phase'. It sounds like we use a second source to increase the radiation. Doesn't it?
Hello everyone, as a part of a course in analog circuits, I need to design a BJT amplifer with the following parameters: Voltage gain = 51 Rin = 55 Rout = 50 Band width: DC suppliers allowed: +/- 5V The purpose is to as less stages as possible. I thought about using two stages : of CB and CE or 2 stages of CB.
Hello, I am trying to apply an adaptive biasing technique to source the differential pair of the fully differential amplifier, the adaptive biasing source a current of let say Ib under small signal condition. Under slewing or large signal behavoiral this current is increased proportionally to the input difference amplitude. My question, I alr
Dear, i will be grateful if anyone can send me the matlab code for using Method of Moment technique to find out s11, directivity and gain of dipole antenna. Thanx
my current starved vco oscillations are dying out after some nanosecond. what could be the possible reasons? and how to rectify it?
Hi everyone, As part of the course i took in analog circuit i required to design an amplifier with these values: Rin= 52kohm Rout = 53 ohm A=35 gain in db F-3dblow = 400hz F-3dbhigh = 400khz M1= 40db/dec M2 = -20 db/dec Dc supply voltage are : +5 v , -5v Transitors are ntype BJT My idea was using a simple CE amplifier with 2 resis
hi all right now am designing three phase protection circuit for that i planned to measure the voltage using resistor net work method, herewith i had attached my circuit and my volt measuring code, everything working good but in sometimes the R phase connected to AN0 pin shows high reading, kindly go through my code and (...)
Hi, The ckt as as draw as attached, is a auto/manual control panel board for pump-motor and trying to configure to run with MCU control auto operation and manual (with start/stop button in board). With the panel here i have included 2 nos relay: Relay-1, NO, parallel connected to START BUTTON and Relay-2, NC, series connected with STOP (...)
How does the shunt tripping module for MCB works. Has anyone disassembled one
Hi, I have designed a temp controller. The temp from the sensor is measured and amplified. I have an relay in my circuit. The relay is connected with the Analog port, but in different pin. Whenever the relay gets turned on the ADC value gets increased. The voltage reference is same at all instance. The chip i have used : Atmega3208.
hai i have watched a video that display a circuit 1.5 to 220v ac inverter is it true plz must ans me if its
Hi all, I'm working on a design that draws power through USB but needs about 1.5A of current at 5V. Hence I'm exceeding the 500mA limit and need to "negotiate" a higher current from the source. I've read various pieces of USB documentation and I understand a small microcontroller would be the way to do this properly. I'm looking for a (...)
I added a new excitaion signal by importing ASCII file BUt the cst gives this below and suddenly aborts : The current settings will lead to an extremely long simulation time. You may improve the simulation speed by: 1. checking the frequency range and units settings 2. reducing the simulation duration 3. checking the mesh to avoid very s