Tube 12AT7 + 6W6 Push - Pull 15WATT P0WER AMPLIFIER Circuit Schematic With Explanation

UAA180 based VU Meter Circuit Schematic With Explanation

The circuit was designed based on the operation of Siemens UAA180 as it functions as a LED driver for light band displays for measuring the level of audio signals.

Part List
R1----22K--1/4W
R2----27K--1/4W
R3----33K--1/4W
C1----1nF
D13---1N4148
P1-----10K--TRIMMER
IC1----UAA180
D1...12-LEDS

LM3915 based AUDIO POWER METER Circuit Schematic With Explanation

This VU (volume-unit) meter is capable of monitoring anddisplaying power levels present at the speaker terminals ofan stereo audio power amplifier.
The levels are displayed in ten discrete steps. This meter is not designed to give an accurate display of the power levels.It is designed to give an approximate visual indication of the audio power output of each channel. For many situations - disco, parties - this is all which is required: the flashing LED's add atmosphere to the situation.
LM3915. This is a monolithic Dot/Bar Display Driver IC made by National Semiconductor. It takes an analog voltage input on pin 5 then drives 10 LED's providing a logarithmic 3dB/step analog display. When measuring power, a 3dB increase means that the power input has doubled. As the power doubles, an additional LED will be lit until the maximum is reached. The display can be bar or moving dot depending on the connection of pin 9 to the positive supply. The LED drive current is regulated which eliminates the need for current limiting resistors.
The supply voltage can be between 3V to 25V. You can download the data sheet from the National Semiconductor website at: http://www.national.com/
The IC is suited to signals with a wide dynamic range such as audio, power, light intensity. In many applications a bargraph meter is faster, more rugged and has higher visibility than an analog (moving coil) or LCD meter.

PARTS LIST

R1-----10K
R2------1K
R3-----390
R4-----2,7K
P1-----100K TRIMMER POT.
C1-----10mf 25v
D1..D10---LED red
I.C. ----LM3915

100 LED’s Solid State Oscilloscope Circuit Schematic With Explanation

It uses a matrix of 100 LED’s for a display, and does suffer from being slow and having rather poor resolution. Still we could display a sine wave running at 500Hz without trouble, that that's not all that dissimilar to commercial solid state oscilloscopes.

The circuit displays an understanding of the mechanics of displaying an analogue waveform. The timebase is simply a LM555 generating a horizontal sweep, while the vertical amplifier is LM3914 with a trimmer pot on the front. It's extremely simple, but it works.

The LED’s are multiplexed by a 4017 driven by the timebase. This arrangement reduces the current requirements considerably, no mean consideration when operating from the power supply of the device under test.

With a device like this, making the unit as small as possible is obviously a consideration. Katz decided to make his own box out of perspex so that he could make it just as big as the circuit board, and no bigger. He was also able to give the thing a fancy shape rather like a bought one.

On the basis that this project had the highest combination of imagination, design ingenuity, construction and documentation, we made it the national winner.

You can see the circuit for this project on page 108 of The Forrest Mims Engineer's Notebook. It's published by LLH Technology Publishing (formerly High Text Publications) and is under $20.00. The ISBN number is 1-878707-03-5. This a 8.5"x11" soft cover manual. This book is full of circuits that the electronics hobbyist will want to try, using many common components. The circuit for this scope was published in August of 1979 in Popular Electronics magazine too, with more details than the book goes into.

The part list:

PC Board (shown is RS 276-147, 4.5"x6.25")

14 pin dip IC socket

16 pin dip IC socket

20 pin dip IC socket (for the 18 pin LM3914)

100 Red LEDs

LM3914 Dot/Bar Display Driver

4011 Quad Nand Gate

4017 Decade Counter/Divider

100K trimmer pot

1K trimmer pot

SPDT switch

1K resistor

0.1μf capacitor

9V battery

9V battery snap

small amount of wire, bus wire, & solder

I really didn't have anything else better to do when I spent a day bending LED legs over to make this very limited o-scope. I built a tiny function generator board to play with the o-scope more, and I tried this board out with a commercial function generator-- it worked ok. You are not going to see anything like what you'll find on a commercial oscilloscope, but you will be able to pick out a square wave or sine wave.

If you've ever thought about building such a circuit and wasn't sure how to go about it, I hope seeing this will help. My board is a bit oversized for the project, as you can see. If I had upped the LED count to 500 or so, I might have decent resolution, but I'd need a bigger board too! What I really use this for is watching audio output, kind of a funky looking bar graph type display. I've changed some values and added a resistor and a couple caps that weren't in the original schematic, but my board follows the book fairly closely.

So, if you happen to have a hundred LED’s laying around that you don't know what to do with...here's the project for you!

Flashing Neon Circuit diagram Circuit Schematic With Explanation

This circuit will be a fantastic circuit for Vehicle lovers Because this circuit can up grade the out look of your Vehicle. This circuit is nothing but a Flashing Neon circuit diagram.This circuit can be operated with 90V.You can change the frequency of this circuit by changing the values of C and R.Large values reduce frequency of this circuit.







Note

# Use Ne 2 or Ne 51

# This circuit can be operated with 90v

Simple Christmas star from multivibrator Circuit Diagram

This is so simple circuit But you can use this circuit as a Christmas star.Here I have used famous transistor 2N3904.If you are unable to find this transistor you can use D400 instead of that.This circuit operates with 9V.I used this circuit for the last Christmas If you used Blue color LED s It would give inexpressible attraction.





Note

# If you want to change the speed of this circuit You can do it by changing the values of 10uf and 100k

# This circuit can be operated with 9V power supply

# Fix this circuit on a pcb

Blinking LED Circuit Schematic With Explanation

This is a blinking LED circuit diagram.Here I have used common IC NE555.If you want to change the speed of this circuit you can change the value of R2.Then you can do that.





Note

* Use a PCB to build this circuit
* You can operate this circuit with 9V

GUITAR OR HI-FI Power Amplifiers 12Watt tube 6BM8 + 6KG6 (EL509) Circuit Schematic With Explanation

GUITAR OR HI-FI Power Amplifiers 12Watt tube 6BM8 + 6KG6 (EL509) Circuit Schematic With Explanation

Quad II POWER AMPLIFIER Circuit Schematic With Explanation

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Tube 6S19P + ECC88 2-5watt (A) Circuit Schematic With Explanation

Tube 6S19P + ECC88 2-5watt (A) Circuit Schematic With Explanation

Touch sensitive Circuit Schematic With Explanation

Here I have design a touch sensitive circuit diagram.For this circuit I have used a common transistor BC 547.Normally this circuit can be operated with 4.5 to 6 v.I suppose you will be able to do lots of things with this.I have used this circuit for my room light.So you also can use this circuit for your room light.





Note

# Use a pcb to build this circuit

# Don't supply more than 6V

smoke sensitive circuit diagram Circuit Schematic With Explanation

Here I am going to introduce you a very important circuit.It is nothing but a smoke sensitive circuit .In the market we can see there are lots of expensive smoke sensitive kits.But I'm going to give you a very simple method to make a smoke detector.Here i have used a dark sensitive circuit.When the smoke goes via LEDs and LDR it will generates a sound.If you want to operate another circuit firstly remove the speaker and add a really for there.then you can operate your circuit through that really.





Note

# Build this circuit on pcb

# Don't use more than 9V

#Use Blue colour LEDs

Tube 6S19P + ECC88 2,5-5watt (B) Circuit Schematic With Explanation

Tube 6S19P + ECC88 2,5-5watt (B) Circuit Schematic With Explanation

Simple Toy Orgen Circuit Schematic With Explanation

This is a toy orgen circuit diagram here I have used very common IC NE555.If you like to generate different sounds you can attach capacitors with different values.according to the value of the capacitor you can change the sound according to your wish.





Note


# Build this circuit on a PCB

# Don't use more than 9v

# Use only push to on switches

Simple radio circit diagram Circuit Schematic With Explanation

some persons asked simple radio circuit diagrams.Here you can see very simple circuit diagram.When I tested this my first time I enjoyed very much.When the signals are coming you can here some sounds like ne ne nee nic nee nee nee nee.so test this and enjoy.






Note:

# Don't use more than 4.5V

# Build this on a pcb

#If the signals don't come move the main coil here and there then you can here some sounds.

# Firstly this circuit was designed by Elmer G. Osterhoudt in the early 30's

230V LED Circuit Schematic With Explanation

Most of you asked about 230V LED circuit diagrams.Today I'm going to introduce you that circuit.I have attached this circuit for my door bell.So that at night I can easily see it.Not only that people can us this circuit to see whether electricity is there or not So use thi9s circuit and get fun....






# Note

# you should be careful when you use this circuit.Because this circuit operates with 230V
# This circuit is not suitable for kids
# When you use electronic parts those parts should have correct values(like W and V)

# Build this circuit on a pcb If the circuit doesn't work don't touch it.Firstly switch off the circuit.

Basic Sound Generator Circuit Schematic With Explanation

This is so important circuit for the persons who came to this field recently.Here I have used common IC NE555.According to the pules (Frequency) of the IC We can generate the sound.You can change the speed of the sound by adjusting R2.This circuit operates with 5V.






# Note

# Don't give over 5V
# Build this circuit on a PCB
# Don't give the much heat to the IC NE555

6H9C-6П13С PUSH-PULL TUBE AMPLIFIER Circuit Schematic With Explanation

Features:
The output stage: push-pull, class A, with a fixed offset in 6P13S tubes in triode switch.
Output Power - 10.5 W
Band Frequency - 25Hz ... 30kHz
Sensitivity - 0.707V (1V amplitude)
THD - 1.5% (before clipping), 0.8 ... 0.9% (half power)
The level of background noise on the output - 1.5 mV

MORE....

MORE....

Burglar alarm Circuit Schematic With Explanation

This is a very useful circuit diagram because these days there are lots of crimes in every where.So I suppose this would be an answer for your matter.Here I have used common Transistor BC107.After fixing this circuit switch on s1 and adjust R2 until the horn makes sound.Then switch off the s1 .Now if some one broke the thin wire the horn will make a sound.You can cover your garden with this circuit

Note

# Build this circuit on a PCB
#Don't supply more than 12V
# Use very thin wire to get good results

TV Transmitter circuit diagram (VHF) Circuit Schematic With Explanation

Most of people ask TV transmitters.So Today I'm going to give you a very useful circuit diagram.By using this circuit you can send your signals 75m to 100m.This circuit diagram is not my own circuit one of my friends gave me this.I suppose you guys also can send your own circuit diagrams for us.Then we can publish them through our website.Here They have used common transistor BC 108 If you are unable to find this transistor you can use equal transistors like Bc337 2n2222 Bc 546














Note

# To make L1 wound 6 turns of #24 enameled wire on a 10mm air former for frequency 60 - 80 MHz For 150 - 180 MHz wound 4 turns and for 180 - 200MHz wound 2 turns.

# This circuit operates with 9V power supply

# When you build this circuit you have to build this on a little space.

# The power of this circuit is 80mW

# use a pcb to build this circuit diagram.

# This is only for educational purpose.We can bear any responsibility of this If you misused this.

# This circuit transmit only video signals .If you want to send sound signals you can use an audio transmitter

Car Reverse Horn Circuit Schematic With Explanation

Most of people have there own vehicles.so I suppose this circuit will be very useful circuit for them.This circuit is a car reverse horn.If you can build your own circuit for your car I think that is great.Here I have used common Music generator IC UM 66.The out put voltage of UM66 is not enough to make a good car reverse horn so by using two transistors (BC148 and BEL187)I have increased it.





Note

# This circuit operates with 12V power supply
# Build this circuit on a PCB to get good results
# use 8ohm speaker.
# Use only push to on switch.