Volt Stabilizer
Welcome back to Free Circuit Dot com, I used to built the Voltage stabilizer for my car,I think ,this is a good circuit to improve your car with simple circuit.
Equipment
1. Cap 10,000 uf 25 v = 2 option.
2. Cap 4,700 uf 25 v = 2 option.
3. Cap 2,200 uf 25 v = 2 option.
4. Cap 1,000 uf 25 v = 2 option.
5. Cap 470 uf 25 v = 2 option.
6. Cap 0.1 uf 25 v = 2 option.
Continued…
Posted in Filter circuit, Switching regulator circuit, battery circuit.
Tagged with battery voltage stabilizer, car Voltage Stabilizer, Stabilizer, Voltage Stabilizer.
By admin
December 13, 2011
O2 meter for car circuit
Welcome back to Free circuit dot com ,Today i would like to show you in about circuit for car .
So,All really knows how to customize the level of production with an LM3914 LED?
What I’m trying to do is read a signal from a pressure sensor in my car exploded and show a more or less accurate reading of impulse (psi) with 10 LEDs. Here is the map of psi Volt:
Electronic Part
-20 = 3.4 V
-10 = 3.1 V
0 = 2.9 V
5 = 2.7 V
10 = 2.4 V
15 = 1.8 V
20 = 1.4 V Continued…
Posted in Sensor.
Tagged with LM340T, LM3914, O2 circuit, O2 detector, O2 sensor.
By admin
December 9, 2011
Solid State Relays Circuit
Welcome to Free circuit dot com ,today we have classic circuit to implement solid state relay in your electronic project .
Solid state relays are almost everywhere these days, but they are very expensive. So, your efforts to build their own salary. Especially since it’s only a few parts and circuit simple and straightforward. Solid state relay is not really at all relays. There are no “relay” is available only with electronics, connection works. It works well as a relay, you can use low voltage higher and better. “Relay” between 115/220V AC wires in place, although it was customary, the neutral conductor and leave unchanged phases and neutral.
As long as no voltage (left in picture), the phototransistor TIL111 blocks of energy, and thus is not available. To ensure that the base TIL111 is fed to the transmitter (s) through the 1M resistor. This method prevents the base of transistor BC547B will be low and remains biased ‘on’. Collector is low and the gate (g) TIC106M thyristor, which is still in the country, “off”. 4-diode bridge rectifier circuit has no power apart from a small base and collector current BC547B, which is not enough to turn over the 330-ohm resistor TIC226M triac. Current “Load”, is very small. Continued…
Posted in Power supply, Switch circuit, relay circuit.
Tagged with BC547B, Solid state, Solid state relays, TIC226M triac, TIL111.
By admin
November 2, 2011
DVD to RF modulator circuit
Welcome back to Free Circuits dot com,It is long time to see you as i’m busy in my working ,OK first of all,
This circuit today is a RF modulator which can be used for moduling of video signals .
P1 control the Light and P2 control the contrast of video signal.
RF modulated output signal can be received on VHF band ( about 189 MHz ).
Posted in RF-circuit, audio amplifier.
Tagged with DVD signals, RF Modulator, VDO signals, VHF band.
By admin
November 1, 2011
Power Amp-TDA 7294
Welcome back to Free Circuit dot com again,Today ,I would like to present a small audio amplifier circuit with TDA7294.
You can follow by PCB thus as my post.
The described circuit uses two TDA7294 for use in stereo (2 x 80 watts) and bridge mode (1x 180 watts), configure this setting only four drivers.
To facilitate the installation of each fuel. The performance is a kind of symmetry with a simple bridge rectifier 6A, and two large electrolytic capacitors, which 10000μF 22000μF/50v. This power supply for two modules. The processor is recommended 22-0-22 to 28-0-28 / 5 A, depending on the quality of the transformer is at least 6 amps is recommended. Continued…
Posted in Amplifier, Power amplifier, audio amplifier.
Tagged with 80W, 80W amplifier, 80Watt, TDA7294.
preamp power supply
This is IRRESPONSIBLE and DANGEROUS!!
Welcome back to Free circuit dot com again,today i would like to present the preamp power supply circuit.
this circuit is small and easy to assembly,we will use IC regulator 7915 and 7815 for main control voltage.
About all capacitors are filter noise and frequency.
We will take diodes to allow an electric current to pass in one direction (called the diode’s forward direction), while blocking current in the opposite direction Continued…
Posted in Amplifier, Power supply.
Tagged with 7815, 7915, preamp, preamp power.
By admin
September 21, 2011
DC to DC Converter with 450Watt
For developper who would like to power supply for your amplifier or other load.Circuit today will be show you in DC to DC converter circuit with 450 Watts.
+/- 50 Vdc for Output Voltage , Voltage adjustable between 47-55 Vdc.
No problem in output Voltage drop when connect load.
We have verified the circuit already. For more detail ,Could you look at the picture thus as below.
Continued…
Posted in Power converter.
Tagged with 50V DC Converter, DC Converter, DC to DC converter.
Mosfet Amplifier K1058 circuit
Welcome back to Free circuit dot com,We would like to present audio amplifier circuit as this amplifier consists of two completely separate mono amp for each channel has its own power supply, so zero inter-channel crosstalk, a common phenomenon in amplifiers, the same diet. 0 – - 40VAC at 640VA To the full power any 40VAC transformer should be evaluated to obtain. Unlike many designs, referring to the capacitors to supply the current peaks, I prefer the raw power available from the transformer, have resulting in faster transients. Continued…
Posted in Power amplifier, audio amplifier.
Tagged with 200W, class A, class A amplifier, K1085, MOSFET 200W, RAS-300.
Digital weight circuit
Welcome back to free circuit dot com,today we are present circuit for digital weight circuit .
This uses a potentiometer as the weight sensing with seven segment LED element.
An moving object on the scale of the potentiometer wiper, an amount proportional to the weight.
Conversion led the wiper voltage of digital information, decode and display interfaces to the numerlc. Continued…
Posted in Detector Circuit, Sensor.
Tagged with ADD3701, Digital weight scale, potentiometer, segment LED.
Microphone preamp circuit
Welcome back to free circuit dot com ,today we have amplifier for microphone with transistor number BC549,BC547 for drive signal.
As this is a simple microphone preamplifier circuit between microphone and stereo amplifier can be used.
The circuit amplifier microphone suitable for use with a normal stereo amplifier line / CD / aux / tape inputs.
The microphone preamplifier can be both dynamic and electret microphone inputs (preamplifier provides foe electret microphone elements). The idea of this circuit is provided that the design as easy as possible for easy build.
Which was my goal when I make a simple external microphone preamplifier for my mixer needed. The behavior of the circuit is nothing better, but with many not so serious projects are used. Continued…
Posted in Amplifier, audio amplifier.
Tagged with BC547, BC549, MicroPhone Amplifier, MicroPhone circuit.
