A serial to parallel converter using the AT89C2051

The example program included with the PG2051 evaluation kit is a basic serial to parallel converter written in 8051 assembler. This is probably a good example of the uses to which an AT89C2051 can be put - it would be hard to get a serial to parallel converter much simpler than the single 20 pin IC in this circuit. The program is meant to serve as a useful example of 8051 serial routines and other programming, whether or not you actually need a serial to parallel converter.

Source: http://airborn.com.au/serial/sertopar.html

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Basic Of Power Supply Wiring diagram Schematic

I was a fan and an electronics Technician. Almost all electronic devices use Power Supply. If you want to know more about the Basic Of Power Supply Circuit Diagram , you can browse the articles in this blog. Here I am trying to write an article about the Power Supply. 

All electronic equipment requires power supplies, either from the battery or use electricity in your home. Electronic equipment usually requires certain power supply consumption. Suppose the voltage for charging mobile phones require only 5 Volt, may not 220V of electricity in your home is connected directly to your cell phone, of course it should be through the Power Supplies that have been adapted to the voltage consumption phone or other electronics, if directly connected to your mobile home electric / electronic you will explode. Except electronic equipment that is equipped with the power supply in it such as a TV, tapecorder, personal computers, VCD, etc. 

Lets see Basic of Power Supply Circuit Diagram below Electronic equipment typically uses direct current (DC) and the voltage and current of the adjustable electrical equipment condition. In the picture I show a basic schematic schema Power Supply is comprised of a transformer is used to reduce the voltage of 220V at the primary and 6V - 12V on the secondary.

So, electronic equipment required for basic of the Power Supply is:
1. Transformer (TRANSFORMER), in this case a 220V input and 12V as output
2. Silicon diodes
3. capacitors
4. Electrolyte capacitors

Basic of Power Supply Circuit, by Bustamsyah

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Basic Monostable Multivibrator based IC 555

The following diagram is the schema diagram of the very basic monostable multivibrator which built based on timer IC 555.

Parts list:
R1 = see notes
C1 = see notes
C2 = 10nF
IC1 = LM555

Notes:

• R1 and C1 determine length of output pulse where t=R1xC1 and R1 is in ohms and C1 is in farads.
• Pin 4 is the RESET. Leave it connected to power supply (+V) during normal operation. Bring pin 4 AND pin 2 low at the same time to reset timing cycle.

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