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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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