Blog Posts - Simple Circuit



Fluorescent lamp circuit uses transistors 2N3055

Fluorescent lamp circuit uses transistors 2N3055 and some other passive circuit. When in a short... [[ This is a content summary only. Visit my website for full links, other content, and more! ]]...
by Circuit-Schematic Electric on Dec 10, 2016

TA8225 BTL Amplifiers circuits

There is my friend want a TA8225′s PCB. But I not have it. Thus I search on internet. The TA8225 is BTL audio power amplifier for consumer application. It is designed for 45W high power, low distortion and low noise. It contains various kind of...

FM transmitter 88-108MHz using two transistors and 1.5V battery

This is also the 88-108 MHz FM transmitter circuit that use 1.5 volts battery power supply source and use two-transistors so easy to builds and small size circuits. Figure 1 the schematic diagram Figure 2 the components layout The coil-L is 8 turns o...

1.5V FM transmitter using a varicap diode and two transistors

This circuit is a 1.5V FM transistor circuit that use also two transistors like others circuit before. But this circuit is special that we use a varicap diode. Figure 1 is a schematic diagram - This circuit use the varicap diode number: SD111 or will...

FM transmitters, 90-100MHz using two transistors and low voltage

Today lets to see the simple FM transmitters,90-100MHz that use two transistors, apply power supply with 1.5V battery The coil-L is 8.5 turns of 22 swg wire wound with a inside diameter air core of about 5mm. Then stretch the coil to width of 9 mm. ...

Low volts stereo preamplifier with tone control circuit

This is the simple stereo amplifier for headphone with tone control circuit that use 1.5V X 2 only. It is used for mini MP3 player or other small source. I like it that use a few parts and low power. How it works To begin with this circuit will conne...

Simple Two Transistors AM Transmitter Circuit

This simple AM transmitter include of many parts. There is a transistor Q1 act as increase the audio signal (AF) from the crystal microphone and a resistors-R3 that limit amplitude of sound signal is increased by Q1 The transistor – Q2 generate...

98-100MHz FM transmitters using one transistor and 1.5 volts battery

This is the small FM transmitters using one transistor and 1.5 volts battery as power supply, in 98MHz to 100 MHz FM frequency range. The coil-L is 8 turns of 18 swg wire wound with a inside diameter air core of about 5mm. Then stretch the coil to wi...

Dynamic Compressors without power supply

This dynamic compressors circuit that The reduction rate of the signal up to 20 dB at input between 100 mV to 10 volts. This circuit does not use external power. But used part of the input signal into a power supply. To reduce size of the signal. A p...

Power outages prediction circuit

This circuit can be used to prevent a power failure. Example: Microcomputer systems. This circuit will send logic pulse “1″ shortly before the power goes out completely. To trigger the power outage protection circuit for working. Or use t...

The transistor lat as SCR trigger

This circuit works similar to a SCR. When the trigger input is high, Both transistors Q2(PNP transistors) and Q1(PNP transistor) will work. Therefore, a current flow to the base pin of Q2, it has voltage 0.7 volts at resistor R1. When cutting the act...

D/A converter circuit for motor controller

We control easily a motor to stop and rotate. If need to control it on linear feature is speed high-low difference so use this circuit. In Figure below, we use the 4 bit comparator circuit that output to the input of EXCLUSIVE-OR gate. Then, it is fe...

Constant current circuit using LED

Normally the voltage drop across LED while forward bias will be about 1.2 to 1.4 volts depend on type of LED by has the temperature coefficient is -1.5 mV per degree Celsius. Which similar to the temperature coefficient of junction. between a base an...

Rising-edge trigger R-S Flip Flop circuit

The normal R-S flip flop circuit include of two nade gate are connected together and when need to set or reset then feed the logic signal is “1” instead trigger and use inverter work instead. In Figure 1 suppose begin state of both input is &...

Super Steady Zener diode circuit

This circuit is used for controls the voltage battery is steady, which the zener diode apply very low current about 1mA only, cause there is ripple voltage about 1 mV at voltage changing between 10 to 30 volts. As circuit the output is fixed to 8V. I...

Simple resistive load

Sometimes we need to use a resistors that without capacitance or inductance. We always use the carbon resistors. But some working to need the resistor that has also many high power. Which we cannot use the carbon resistor because it has maximum power...

Noise Filter for Stereo system

In the receiver, stereo radio station. Usually have more noise than listening in mono. Because, the stereo system is splits signals-to-noise ratio. (S/N) There level lower, cause interference, in mono with less. becausePhase noise of the 2-back phase...

Dual DC power using 2 terminal transformer

There are many ways to build the dual power supply from a transformer that has one secondary coil.This good way as Figure 1 use two bridge diodes. The first section is normally working, others section (D1-D4) will work by AC signal from C1 and C2. To...

Hum Filter using electronic coil

There are many ways to filter the hum noise from AC line (50 Hz) from audio signal away. A frequency filter usage is a simple ways that include RLC as the electronic coil. In Figure 1 is the specific frequencies filter. Figure 1 the simple specific f...

Simple 555 ICs tester circuit

Most IC-555 is used to generate frequency, and sometimes we need to know. Is it good or bad? But normal multimeter cannot check it. Thus, I make a simple 555 ICs tester circuit. Which is tested correctly and faster. How it works Resistors R1-R3 acts...


Trending Topics

Close