Showing posts with label simple. Show all posts
Showing posts with label simple. Show all posts
Friday, March 27, 2015
Simple Melody Generator Circuit Diagram
This is so impotent circuit for you all.On the other hand this is so important circuit for beginners.Here I have used IC UM66 You can get various musics when you buy UM66 with different numbers.
Note:
# Dont supply more than 3V
# Build this circuit on a pcb
Tuesday, March 24, 2015
Simple Zener Tester Schematic
The circuit can be simply Q1 is connected as a current source. By D1, there is a constant voltage on the base, and it is worth considering the selected resistor in the emitter approximately 5.6 V. With an emitter resistor of 5K6 R2 will then 1mA through the transistor.
With the chosen resistors in the circuit the current is approximately: 1mA, 2mA, 5mA, 10mA and 20mA. Great precision is not required.
If meter is chosen here for a small DVM module. However, every other meter is applicable, provided that the input resistance is high enough.
Construction:
The circuit is simple to build on a piece of PCB holes. Note that the DVM module separate from the circuit galvanic isolated power supply needs.
Using
Connect the test zener diode between the terminal A and K. Start with a current of 2mA. This is a safe value for most type zener diodes. Depending on the type of zener diode, may be chosen for a greater current. Than the Zener voltage will vary slightly.
Join the zener diode on backwards, the meter will indicate approximately 0.7V. The same picture shows an ordinary silicon diode. A germanium diode, a voltage of about 0.3 V to 0.4 V indicate when a Schottky approximately 0.2 V indicates.
Connect an LED to A and K, it will be highlighted and the Vforward (LED voltage) of the LED indicate.
The diode / LED failure, the meter displays zero if the voltage at the collector of Q1 is, this is> 25V.
parts List
Bridge rectifier BR1 = 40V 500mA
R1 = 3k3 ¼ W
R2 = 5K6 ¼ W
R3 = 2k7 ¼ W
R4 = 1k ¼ W
R5 = 560 ohm W ½
R6 = 270 ohm ½ W
C1 = 470µF 35V
D1 = 6V2 zener 400mW
Q1 = BC161-16
S1 = on / off switch
S2 = 5 modes 1 mom ignition switch
ENG = The diode under test (Device Under Test)
DVM DVM = module of BACO or Dick Best (input adapted to 200V)
Monday, March 23, 2015
How to Make a Simple DC to DC Voltage Doubler Circuit Diagram Using IC 4049
The following circuit can be used for doubling any DC source voltage (up to 15 V DC). The presented design will double any voltage between 4 to 15 V DC and will be able to operate loads at current not more then 30 mA.
As can be seen in the diagram, this DC voltage doubler circuit employs just a single IC 4093 for achieving the proposed result.The IC 4093 has six gates in all which are all effectively for generating the discussed voltage doubling actions.
Two of the gates out of the six are configured as an oscillator. The extreme left of the diagram shows the oscillator section.
The 100 K resistor and the 0.01 capacitor form the basic frequency determining components.
A frequency is imperatively required if a voltage stepping actions needs to be implemented, therefore here too the involvement of an oscillator becomes necessary.
These oscillation become useful for initialing the charging and discharging a set of capacitors at the output which amounts to the multiplying of the voltage across the set of capacitors in a such a way that the result becomes twice the applied supply voltage.
However the voltage from the oscillator cannot be preferably applied directly to the capacitors, rather its done through a group of gates of the IC arranged in a parallel way.
These parallel gates together produce a good buffering to the applied frequency from the generator gates so that the resultant frequency is stronger with respect to current and does not falter with relatively higher loads at the outputs.
But still keeping the specifications of a CMOS IC in mind the output current handling capacity cannot be expected to be larger than 40 mA.
Higher loads than this will result in the deterioration of the voltage level toward the supply level.
The output capacitor values can be increased to 100uF for getting reasonably higher efficiency levels from the circuit.
With 12 volts as the supply input to the IC, an output of around 22 volts may be acquired.
Sunday, March 22, 2015
Simple Mixer with 4 Input
Here the simple mixer with 4 input and 2 op-amps:
Simple Mixer with 4 Input Circuit diagram :
A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net gain of ten (or any other reasonable gain) by reducing the input resistor towards the second op amp. 10K in this position gives a gain of ten, or 20db. In case you are mixing effects outputs that have an output level control constructed into them, you are able to dispense using the input level controls, or make some have level controls, some not. Audio taper pots are possibly much better, but linear will do the job.
For the op amps, choose a JFET input dual or singles, such as from the National Semi LF3xx series, or something such as the TL072 or TL082.
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