PCB assembly service (PCBA) is a part of the electronics manufacturing process where  electrical parts are mounted on printed circuit boards (PCBs) by surface mount technology and plated through-hole technology. Based on the different quantities of circuit boards to assemble, there are prototype assembly, small batch PCB assembly, batch PCB assembly and high volume PCB assembly. Though many engineers, student or hobbyists try to etch their PCBs at home it is actually a very messy method and uses a lot of chemicals. The process to design PCBs can also be time-consuming. Hence, an efficient ..read more

Christmas is in the air! And it is incomplete without a sale!! Like every year, this year too PCBWay is going to celebrate Christmas with a Big Christmas Sale for all of you. Here, in this article we are going to explore all the offers that you can avail in the sale from PCBWay. So, let’s get started. 1. Free Christmas Coupons You can visit PCBWay site and avail upto $435 coupons on first come, first serve basis. How to use the Coupons ? Each PCBWay account can collect all coupons above and each coupon can be got only once. You The post PCBWay Christmas Big Sales 2023 appeared first on El ..read more

Q1. The serial format for transmitting binary information uses: a) a single conductor b) multiple conductors c) infrared technology d) fiber-optic Answer : a Q2. Which device(s) have almost ideal ON and OFF resistances? a) electromechanical relays b) manual switches c) semiconductor devices (diodes and transistors) d) electromechanical relays and manual switches Answer : d Q3. A diode placed in parallel across a relay coil serves what function? a) to regulate input voltage b) to protect the coil from arcing c) to ensure most of the current passes through the coil d) to reduce arcing across the ..read more

Q1. A(n) ________ consists of a programmable array of AND gates that connects to a fixed array of OR gates and is usually OTP. a) GAL b) CPLD c) PAL d) SPLD Answer: c Q2. What is another name for digital circuitry called sequential logic? a) logic macrocell b) logic array c) flip-flop memory circuitry d) inverter Answer: c Q3. When did the first PLD appear? a) More than 10 years ago b) More than 20 years ago c) More than 30 years ago d) More than 40 years ago Answer: c Q4. SPLDs, CPLDs, and FPGAs are all which The post Multiple Choice Questions and Answers on Programmable Logic Device appeared ..read more

In the past electronic product design, we often choose to DCDC chips, often encountered in the selection process of DCDC chips have synchronous rectification and asynchronous rectification of two kinds(source: Easybom.) We often see a bootstrap capacitor in such DCDC circuits, often marked on the chip pin BS or BST, as shown in the figure below, Tuoerl Micro’s TMI3494, which chose a 0.1uF capacitor used to bootstrap. So, why is it called bootstrap here? We can analyze it step by step. First of all, based on the Buck topology of the DCDC chip, the bootstrap capacitor is not necessary, such The ..read more

What is Programmable Logic Arrays ? Combinational logic circuits are implemented using programmable logic devices such as programmable logic arrays (PLAs). A set of programmable AND gate planes, a set of programmable OR gate planes, and a set of programmable AND gate planes in the PLA can be conditionally complemented to produce an output. It should have M OR gates with programmable inputs from all of the AND gates for M PLA outputs, and it has 2N AND gates for N input variables. This pattern can be used to generate a wide variety of logic functions in the canonical forms The post Comparison B ..read more

Types of Aircraft Transponders and their Use in Aviation What is Transponder? There are two types of equipment used in telecommunications, one of which is a transponder. An autonomous transceiver in an aircraft that responds to an interrogated receive signal for radio frequency identification (RFID) or air navigation by sending out a coded identifying signal is known as a flying transponder. Without altering the received signal or signals, a satellite transponder in a communications satellite usually receives signals via the uplink frequency range of a satellite earth station, amplifies them ..read more

Q1. Which of the following commands will copy the contents of location 4H to the accumulator? a) MOV A, 04H b) MOV A, L4 c) MOV L4, A d) MOV 04H, A Answer: a Q2. The statement LCALL READ passes control to the line labelled READ. a) True b) False Answer: a Q3. Which of the following commands will copy the contents of RAM whose address is in register 0 to port 1? a) MOV @ P1, R0 b)MOV @ R0, P1 c) MOV P1, @ R0 d) MOV P1, R0 Answer: c Q4. The following program will cause the The post Multiple Choice Questions and Answers on 8051 Microcontroller appeared first on Electronics Post ..read more

Q1. A cavity resonator is a) a hollow metallic enclosure b) a hollow enclosure having magnetic material as its walls c) a hollow enclosure having dielectric material as its walls d) either (b) or (c) Answer : a Q2. If antenna diameter is increased four times, the maximum range is increased by a factor of a) √2 b) 2 c) 4 d) 0.2 Answer : c Q3. Assertion (A): Gunn diode is a transferred electron device. Reason (R): A Gunn oscillator uses the phenomenon of transferred electron effect. a) Both A and R are correct and R is correct explanation of A The post Multiple Choice Questions and Ans ..read more

Multiple Choice Questions and Answers on Microprocessors Q1. An I/O processor controls the flow of information between a) cache memory and I/O devices b) main memory and I/O devices c) two I/O devices d) cache and main memory Answer : b Q2. 8255 A is a a) programmable peripheral interface b) I/O device c) memory chip d) none of the above Answer : a Q3. When the mains supply is switched off the contents of primary computer memory are lost. a) True b) False Answer : a Q4. Incompatibility between memory and I/O device may be due to a) timing The post Multiple Choice Questions and Answers on Micro ..read more