This circuit automatically fan or a fan for your computer, electronic project, the circuit is only valid for your project.
This circuit is known as a thermal sensor. In principle, this circuit or NTC thermistor as a sensor. This diagram, where the temperature is almost simple sensor data subsequently amplified by Op-Amp 741, which is then compared with pl P2, etc. served as governor of sushi, then transistor Q1 to move Relay.
heat sensor circuit
Transistor Q1 is a 2N2222 (A) 2N3904, NTE123A, ECG123A, etc. Not all are critical. Only acted as a relay for each type of work, therefore, deconvolution, the length of the energy needed to activate the power coils. D1, 1N4148, acts as a spark arrester on the relay contacts open and abolishs to false trigger. Feel free to use another type of matter, such as 1N4001 or something. Solder directly on the ‘+’ and ‘-’ relay terminals.
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Posted in Switch circuit, Temperature Circuit.
Tagged with auto fan cooling schema, automatic cooling for amplifier, heat sensor, heat sensor with fan cooling circuit using sensor in4148, how ic 741 work, LM741 ic project, lm741 temperature circuit, lm741 thermostat, name of project based on 741 ic, ntc lm741, skema relay ND.
This is a multifunction telephone network cable tester. It is the design of the network cable (RJ45) test, and telephone (RJ11). It is cheap and easy to use.
Originally I planned to spend half of the remote cable testing is installed, but never done, and super cheap and pretty good cable testers have flooded the market idea was abandoned. Some friends who performed the maintenance on your computer, this thing borrowed some cables a few times to test. They always like to use it.
network cable tester circuit
It works for network, telephone, cable with RJ45 half “Registered Jack” plug immediately indicate whether a crossover network cable or straight, flashing a yellow or green LED. If something is broken or if you press the button, the tester is in line with the wire test. Continued…
Posted in IC555 circuit, LED Circuit.
Tagged with cable tester, network cable tester, RJ45 cable tester, RJ45 tester.
1Watt RF signal amplifer circuit
Regarding the circuit is a universal 1 W. RF signal class C amplifier which is ideally suited for reduce to low power FM transmitters.
The Input much be least at 100mW for achieve 1Watt output. This is recommended to enclose the amplifier in a metal case.
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Posted in Amplifier, audio amplifier.
Tagged with 1 W Amplifer Class C, 1 Watt RF Amplifer, RF Class C Amplifer.
The LM359 consists of two courses of differentiation (Norton) input amplifiers. Design emphasis on achieving high frequency performance and operational characteristics allows a user programmable amplifier.
Electronic List
VDO amplifier IC LM359 Circuit
R1=1Kohm
R2-3=12Kohm
R4-5-6=10Kohm
C1=10nF 100V
C2-6=100uF 25V
C3=100nF 100V
C4=1pF ceramic
C5=10nF 100V
C6=100uF 25V
IC1=LM359N
J1-2=BNC connector
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Posted in frequency amplifier.
Tagged with IC LM359, VDO Amplifer, Video Amplifer.
Overview
The construction of the circuit has been increased to highlight and amplify video signals for further frequencies on image clarity.
VDO amplifer circuit
Terminology
LH0024 – IC small signal IC designed for general purpose switching and amplification due to its low voltage, low voltage and three different win the election
1N4148 – silicon small signal diode planar epitaxial used for fast switching applications with a reverse voltage of 100 V and forward current of 150 mA
Circuit Explanation
In a video output signal is the high rate of frames selected for amplification of producing a finer. This is possible by placing the track between the video device and the reception lobby, where the video port of the television receiver is inserted. The construction is done simply by exploiting the operation of three transistors instead of IC and other supporting elements.
An isolator operating in the first phase of the Q1, which provides an interface for input impedance. Q2 manage the second phase, which leads to the common base configuration.
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Posted in frequency amplifier.
Tagged with LH0024, RF amplifer, VDO Amplifer Circuit, Video Signal Amplifier.
UHF TV amplifier Circuit
This UHF broadband amplifier (Ultra High Frequency Amplifier) is a total win 10-15 dB 400-850 MHz frequency range, so it can be used if the TV signal is weak.
This UHF-TV antenna amplifier to work properly you need to cut parts of the pins as short as possible. C1, C2, C6, C7 SMD type (surface mounting). This TV antenna amplifier or UHF broadband amplifier is built in a metal box and then connected to a TV near the antenna.
Power supply is a simple 12V stabilized source. TV antenna amplifier can be connected directly to the power supply via coaxial TV antenna, but you will need 10 – 100UH coil is a food bar. TV UHF amplifier connected through a small coupling capacitor.
Adjustment is easy, that P1 in the middle and adjust it until you get the best TV picture quality.
Posted in Amplifier, frequency amplifier.
Tagged with diy uhf amplifier, uhf antenna booster, uhf antenna design, uhf tv preamplifer.
29 MHz-Amplifer Circuit
In the high frequency amplifier Ruhestromein is an emitter-follower transistor, which corresponds to a bias current of a control input voltage external input directed to a base of the transistor connected gain. The transistor for current control connected in series with the emitter of the transistor to bias supply, and avoids electrical current corresponding to the control input voltage. Electric power under control procedure input voltage flows through the first transistor for temperature compensation. Electricity equivalent electric current through the first transistor for temperature compensation flowing through the transistor for current control.
Posted in Amplifier.
Tagged with angular frequency circuit, frequency amplifier, frequency circuit, high frequency op amp, op amp circuits, op amp frequency response.
Firstly, the battery is charged, discharged and stored very carefully.
We normally think of batteries can be stored for several months (if not years), and are available for immediate use.
This is not the case with the SLA batteries.
When you save a new, fully charged battery SLA for 6 months or longer, you may find it completely empty.
You may find you can not charge! It may be worthless.
That’s how fragile the SLA batteries.
You must be recharged regularly, so do not take on a very low voltage.
When the terminal voltage of the battery SLA should go into 8V, begins a process called sulfation on the surface of the slab and prevents battery recharge. Battery internal resistance increases, and it will be useless.
More about this at the end of the article.
How does the circuit
Circuit consists of five components:
R1= 1Kohms D1= 1N4001 T1= 220V/17V 4A Transformer
R2= 1.2Kohms D2= 6.8V 0.5W zener LD1= Green LED
R3= 470 ohms TR1= 4.7Kohms trimmer LD2= Red LED
R4= 470 ohms Q1= BTY79 or similar 6A SCR M1= 0-5A DC Ampere meter
R5= 10Kohms Q2= C106D SCR S1= 10A D/P On Off Switch
C1= 10uF 25V GR1= 50V 6A Bridge Rectifier F= 5A Fuse Continued…
Posted in Battery Charger.
Tagged with battery charger ic, battery charger maintainer, car battery charge circuit, car battery charging system, car charger ac adapter, lead acid battery charger circuit, lead acid battery charger project, make car battery charger.
2 input mixer circuit
Electronic Parts
R1, R3 10K Pot
R2, R4 100K 1/4 W Resistor
R5 6.8K 1/4 W Resistor
C1, C2, C3 0.1uF Capacitor
Q1 2N3819 Junction FET
If two outputs are wired in parallel directly, you are effectively in combat with each other. When they are different from sending audio signal, then most of the time one of them tried to push output is different than other output. This causes stress and overload of outputs effectivley. In the best case, you get uneven mixture of the signals lowered output and increased distortion of the sound. In some cases, you run the risk of damage to the device for you are constatly overload the outputs. Continued…
Posted in Audio Mixer.
Tagged with 2 input mixer, 2N3819, Audio Mixer, FET mixer.
3input_mixer_circuit
This is a very simple 3-input mixer for your audio system. You can set the number of input adds some components to the mixer input (add P = 10K R = 22K). This circuit is recommended only for low-and moderate-audio sound system. Need a better mixer circuit for high-quality audio system.
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Posted in Audio Mixer, audio amplifier.
Tagged with Audio Mixer, BC109, sample mixer.
