Do not Throw your Old Computer

If still have an old computer PC with i386 Processor, maybe you can still used it and take advantage from this old computer with open source software.
You can install Unix Operating System such as FreeBSD Unix or Linux Operating System.

The hardware minimum system for Installing Free BSD is :

32bit x86 Intel Processor such i386, 80486 or higher CPU with minimum 64MB RAM or 128MB RAM with 1.5 GB hard drive memory.

amd64 Processor , inlcude AMD Athlon, AMD opteron , multi core Intel xeon, and Intel core 2.

While for Linux Operating System support Processor Intel 80386, 80486, Pentium, Pentium Pro, Pentium II, Pentium III CPU, these includes processors such 386SX, 486SX, 486DX, and 486DX2, included Cyrix Processor and AMD Processor.

The Advantage of Old computer is for small business industry and home small business owner , you can have low cost for software and hardware budget for running your business. You can email, browsing, also make spreadsheet calculation and financial plan and accounting also office function can be done with Libre Office , and printing also can be done. Simplify this, you can have your own business office with old computer and old printer, also you need router for connecting to Internet.

For Example I used Opensuse Linux for my notebook. So I do not have to worry about copyright issue software. Because all software that I need for working in home are open source such as Libre Office, KMail, etc.

This is capture from my notebook , I use opensuse for Operating System.

 

And for Using Printer, We use share printer in the home network. Although the Server we use still using Windows OS 7 , because it is not belong to me. But The Ideas of this plan is to reduce or minimize your SOHO or small business from taking his/her budget from capital for buying expensive system of small hone network computer. And you can still save your budget for other used.

And here it is how I setting my notebook connecting to Wireless printer outside of my room.

I am using Motorolla Modem, TPLink Router, Sony Vaio Notebook and PC Intel Computer  

4G LTE 4 Pole Inter Digital Filter for Digital TV

This is the design of 4G LTE filter for Digital TV . As we know some of 4G LTE transmit frequency , overlapping with Digital TV reception frequency on 698 - 806 MHz. So, this 4 Pole Inter digital Filter made from aluminium plate and copper rod. You can experiment with it , I am not tested yet, for another design you can follow from VK3UM software online at VK3UM.com

LM 335 Temperature Sensor Circuit

Temperature Control Circuit :

Image Courtesy Texas Instrument

The temperature controller circuit using +5 V voltage source from I/O slot at IBM PC/XT/AT.

IC LM 335 from Texas Instrument have the ability to detect temperature from ranging -40 celcius degree until 100 celcius degree.

This LM 335 from Texas Instrument , is zener diode which have the linear coefficient voltage increment related with increment of temperature with formula :

Vz = + 10 mV/ C (celcius degree) , with current opeartion between 400 uA until 5 mA.

On the circuit Resistor 2.2 K use for limit the current flow to cathode pin from LM 335 which is output of LM 335 sensor temperature.

On circuit Resistance of R is 2.2 K , and at 25 Celcius degree from data sheet of LM 335 , voltage at LM 335 will be 2.982 Volt , so current flow can be calculate :

Vcc = + 5 V

Voltage at 25 Celcius on LM 335 = 2.982 V

Voltage at Resistor R 2.2K is = 2.018 V

Current flow through LM 335 and R will be = 2.018 V / 2.2 K = 0.9 mA

This 0.9 mA current at LM 335 still on at range of sensor LM 335, and then the output cathode pin of LM 335 sensor from Texas Instrument connect to input 0 of ADC0809 Analog and Digital convertion data from Texas Instrument at pin 26.

Temperature Sensor LM 335 from Texas Instrument

Temperature Sensor using IC LM 335 from Texas Instrument. LM 335 is Zener Diode which sensitive of temperature change in it surrounding , which is reverse bias on it breakdown area with output :

Vz = [10 mV/Kelvin] …..........[2-1]

Because there is gap different 273 degree between Kelvin and Celcius , so the output in Celcius for LM 335 from Texas Instrument will be :

Vz = 2.73 Volt + [ 10 mV/Celcius] T.........[2-2]

where T is in Celcius Degree

IC LM 335 from Texas Instrument have temperature range between -40 celcius degree – 100 celcius degree

I use LM 335 in Plastic Package TO-92 , another package for LM 335 is SOIC 

Images courtesy Texas Instrument

Another IC temperature sensors from Texas Instrument are LM135, LM135A with TO-46 package, LM235 and LM235A in TO-92 package and LM 335 and LM 335A in SOIC package.

From this writing, I want to discuss about Simulation control system with IBM PC 

XT/AT for Temperature, heater, and pump using LM 335 as sensor, PIO 8255, ADC 0809 , MOC  from motorolla , and TRIAC .

This control system operate with software with QBasic , and I will write the schematic diagram, implementation, and software design.

For more data about LM335/LM335A . please visit data from Texas Instrument , here

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