miércoles, 4 de enero de 2017

Interesting Electronic Technical Schematics



1) Audio Power Amplifier


The following diagram is an audio power amplifier of 2x8.5W, the amplifier is stereophonic and I did a test with mp3 audio of a cell. To control the volume, I used the circuit shown below, which is a voltage divider with coupling capacitors and protection.


Volume Control
Hardware:
  • 1 IC LA4508
  • 2 Speakers 8 ohms
  • 1 Diode DS1307
  • 2 Ceramic Capacitor 0.01
  • 2 Electrolityc Capacitor 1000 uF
  • 2 Electrolityc Capacitor 220 uF
  • 2 Electrolityc Capacitor 100 uF
  • 2 R 160k
  • 1 Ceramic Capacitor 100 nF
  • 1 Ceramic Capacitor 1.5 nF
  • 1 Pot 100k

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2) VU meter


The VU meter circuit serves to observe the amplitude of an audio signal and using LEDs. Simply you have to feed the audio input and potentiometer serves to regulate the audio level LEDs.




Hardware:
  • 1 IC KA2284
  • 5 LEDs
  • 1 Electrolityc Capacitor 10 uF
  • 1 Electrolityc Capacitor 2.2 uF
  • 1 R 56
  • 1 Pot 10k
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3) LDR Night Sensor


The LDR is a light sensing resistor, and when the LDR is in the presence of light, resistance is minimal. In this case the diagram is designed so that when there is no light then the LED is turned on. The residtance range and sensitivity of a photoresistor can substantially differ among dissimilar devices.







Hardware:
  • 1 Battery 5V
  • 1 LDR
  • 1 LED
  • 1 R 330
  • 1 R 1k
  • 1 Pot 100k
  • 1 Transistor 2N2222
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4) AM Transmitter


The next AM transmitter has very low transmission power, so that is only didactic use and only can transmits to no more than five meters. Anyway you should verify the applicable standards. The two potentiometers are 10k and can adjust the transmission frequency of 540-1600 KHz







Hardware:
  • 1 IC 555
  • 1 Ceramic Capacitor 1 nF
  • 1 Electrolytic Capacitor 100 uF
  • 2 Pot 10k 


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5) FM Transmitter


This FM transmitter has very low transmission power, so that is only didactic use and only can transmits to no more than five meters. Anyway you should verify the applicable standards. You should change the number of turns of the coil to have a good tune.



Hardware:
  • 1 Mic
  • 1 Antenna
  • 2 Transistors 2N2222
  • 1 L 5 laps
  • 2 Electrolytic Capacitors 10uF
  • 1 Ceramic Capacitor .1
  • 1 Variable Capacitor 5-60 pF
  • 1 Ceramic Capacitor 1pF
  • 2 R 1k
  • 1 R 10k
  • 1 R 15k
  • 1 R 6k8
  • 1 R 4k7
  • 1 R 2k2
  • 1 R 220
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6) 5V and 3V Level Translator


 

This is a simple circuit to interface 5V to 3V.  3V logic is preferred to 5V logic because it consumes less power, some handy bidirectional commercial ICs such as the ADG3231 or CD4050 from Analog Devices can handle the translation function, but can be cost prohibitive. Translating 3V to 5V is the easiest task.  Usually a 3V output can directly connect to a 5V input..

I used the Schottky diode without problems in the following examples of projects (Bias voltage of 0.18 to 0.20 volts):

https://www.amazon.com/Guillermo%20Perez/e/B01EZOTUVQ/

guillengap@gmail.com



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