Popular Circuits Page 105
- Page 105
-
The design of solar panel systems with a (lead-acid) buffer battery is normally such that the battery is charged even when there is not much sunshine. This means, however, that when there is plenty of sunshine, a regulator is needed to prevent the battery....
-
-
This be LED VU Meter by IC LM3914 circuit show with LED convenient for the stereo or sound all signal. This easy circuit again because use IC LM3914 show get 10 the level. Build easy because use the integrated circuit just one and the price is inexpensive.....
-
1kHz square wave signal generator As shown by the time base circuit NE555 plus the time constant circuit (47 kfl O.Q15 UF) composed of] hair kHz square wave signal generator. ..
-
The delay time for all circuits shown has been revised. The optimum is around 100ms - sufficient for around 5 full cycles at 50Hz, or 6 cycles at 60Hz. It is also quite alright to run the transformer to around 200-500% of full load current at start-up, and....
-
You can obtain well over 360° of phase delay by cascading two monostable multivibrators. In a typical configuration, a single monostable multivibrator is used to introduce delay in a pulse train; the multivibrator triggers on each incoming pulse, provided....
-
By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well. The shorter steel rod is the ""water high"" sensor, whereas the longer is the ""water low"" sensor. When the water level is below....
-
-
The AD650 V/F/V (voltage-to-frequency or frequency-to-voltage converter) provides a combination of high frequency operation and low nonlinearity previously unavailable in monolithic form. The inherent monotonicity of the V/F transfer function makes the AD650....
-
I would start by making certain that no light bulbs on the vehicle are burnt out, particularly the turn signal lights, brake lights and dashboard indicator lights. Funny things happen when bulbs are burnt out. It sounds like you know your way around a meter,....
-
The figure can add a buffer gate at the input, so that the circuit compatible with TTL or other logic. This request is to TTL0V circuit to 3.5V input signal swing to..
-
Two NAND gates are used for the oscillator, and two as the control. If the two-tone speed needs to be altered, the 220 µ capacitors can be changed Oarger for slower operation). If the frequency of the oscillator is to be changed, the 0.2 and 0.1 /iF....
-
Transistor Q5 and the 1000 ohm resistor form the variable element needed for controlling the frequency of VCO by limiting the charging current flowing into the 0.15 timing capacitor according to the forward bias being applied to Q5. As the voltage on pins 2....
-
-
I want/need better headlights. I`ve been trying to study up on this - including the on-going forum discussions. But, I think I need some basic info....
-
This is a universal version of the Four-Digit Alarm Keypad. I`ve modified the design of the output section - to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I used a SPCO/SPDT relay - but you can use a....
-
The presented project is a function generator for sinusoidal and square signals production. The output frequency covers the range from 10 Hz to 100 KHz with a step of 2 Hz.
The waveform synthesis is based on the D.D.S. technique (Direct Digital Synthesis)....
-
This circuit is useful for removing ground loop hum on a remote line level audio signal line. It can be used to to connect a computer sound card to a stereo amplifier`s line input. Other uses include tapping into a line level signal for powering a remote....
-
This is the latest BH1417 FM Transmitter architecture from RHOM that includes a lot of appearance in one baby package. It comes with pre-emphasis, limiter so that the music can be transmitted at the aforementioned audio level, stereo encoder for stereo....
-
-
The microphone input, MIC1, is fed through C3 and R4 to inverting amplifier U2-a; the gain of U2-a is controlled by potentiometer R5. The output of U2-a is fed through C4 to the remaining op-amps (U2-b, U2-c, U2-d), which are all configured as....
-
A unijunction transistor audio oscillator drives a small speaker. The oscillator"s frequency is determined by resistor R2 and capacitor C2. The ope rating voltage is supplied from the car"s turn-signal circuit(s) through Dl and D2. ..
-
Introduction: It is not any real perpetuum mobile, source of free energy from the atmosphere or anything like that, but it is, especially for beginners and enthusiasts of alternative energy sources, an unusual and very interesting experiment :). This device....
-
This project deals with the design and development of theft control system for automobile, which is being used to prevent/control the theft of a vehicle. The developed system makes use of an embedded system based on GSM/ GPS technology. The designed and....
-
Here`s an antenna selector, Preselector, attenuator, preamplifier accessory for every HF amateur transceiver. It can improve your receiver`s IP2 for out-of-band signals and yield good flexibility. My father, I4FAF (an old-timer) and I both very much like....
-
Hi I am testing wein bridge oscillator and I looking to make it work. I have study the page below, but there are some concept i do not understand....
-
If a strip of conductive metal is stretched, it will become skinnier and longer, both changes resulting in an increase of electrical resistance end-to-end. Conversely, if a strip of conductive metal is placed under compressive force (without buckling), it....
-
Cars are fixed as shown in the circuit composed of LM723 regulator circuit, it can replace the use of an automobile generator system consisting of electromechanical charging re..
-
The common 555 timer IC forms the heart of the circuit. Its function is to charge the unknown capacitor (Cx) to a fixed voltage. The capacitor is then discharged into the meter circuit. The meter measures the current being drawn through the 47 ohm resistor.....
-
A small audio test generator is very useful for quickly tracing a signal through an audio unit. Its main purpose is speed rather than refinement. A single....
-
This metal detector circuit diagram is based on the TDA0161 monolithic integrated circuit, designed for metallic body detection by detecting the variations in high frequency Eddy current losses. Output signal is determined by supply current changes.....
-
A. B, C for big power split phase I, A + B'C 'Rang generator phase line, A-A' indole path string has a 2H220V / 15W bulbs, bulbs recovery as both macro instructions J Sweet World as Well buck's electric brake sheet J. W Lamp wooden pole end....
-
A piezo is an electronic device that generates a voltage when it`s physically deformed by a vibration, sound wave, or mechanical strain. Similarly, when you put a voltage across a piezo, it vibrates and creates a tone. Piezos can be used both to play tones....
-
It can give ample light even for reading purpose. Capacitor CX along with diodes D1 through D4 forms the AC step down circuit. CX reduces high voltage AC from mains to a low voltage AC which is rectified by the diodes D1-D4. Capacitor C1 removes ripples from....
-
I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no....
-
This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
-
-
-
A power supply in a system utilizing as a source of fuel a generator for separating hydrogen and oxygen gasses from natural water and having the capabilities to control the production of gasses by varying the amplitude of the voltage and/or the pulse....
-
-
To extend the measurement range of an available ADC(analog to digital conveter) we can use this autoranging. If it implemented on multiplexed input, this....
-
Timers are widely used in industrial and domestic application for automating tasks. Microcontrollers can be used to design versatile and accurate timers with...
-
-
The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance. The mixer is formed assembling three main modules that can be varied in number and/or disposition to suit everyone needs. The....
-
I am again here with another basic electronics projects, this time we are here to make our own regulated power supply We need a regulated supply so many times while working with electronic circuit, so we must have knowledge about regulated power supply, so....
-
A very simple low power AM FM radio receiver electronic projects can be designed using the TA8122 integrated AM FM receiver, manufactured by Toshiba Semiconductor. This radio receiver circuit can be used for portable radio applications or other similar....
-
Hi all, I completed my first amp a few months ago. It was more a test than really something to listen to. It used the 9240/240 Mosfets. Now I want to....
-
Here is a high performance RF amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without any special test equipment. The grounded-gate configuration is inherently stable without any neutralization if appropriate....
-
-
-
Buffer amplifier Shown in use as a transistor emitter follower buffer amplifier for applications that require high input impedance of the amplifier. Complementary push-pull cir..
-
This circuit controls a Searchlight type signal head and produces solid - RED, YELLOW or GREEN indications. The signals can be connected for NORMAL or APPROACH type lighting of the Green signal. The circuit uses a LM556 - Dual Timer IC in a complimentary....
-
-
The circuit uses a free-running push-pull dc to dc high voltage converter to get the necessary voltage for the laser plasma tube supply. The supply voltage Vc of this converter, is adjusted by a switch-mode power supply in order to keep the load current....
-
Common mode signal of emitter-coupled differential amplifier circuit a At the input of the circuit is assumed that two equal small increase, of the same polarity signal (referr..
-
-
This circuit is particularly applicable to digitally-controlled systems in robotic and X-Y positioning applications. By functioning from the 5-V logic supply, it eliminates additional motor-drive supplies. The tachless feedback saves additional space and....
-
A simple triangle/squarewave generator using a common 1458 dual op-amp that can be used from very low frequencies to about 10 Khz. The time interval for one half cycle is about R*C and the outputs will supply about 10 milliamps of current. Triangle amplitude....
-
The SLA battery is charged from the vehicle s battery. When the engine is running, the voltage remains fairly constant, which greatly simplifies the charging circuit. If the SLA battery is fully charged, any further charging current from the vehicle battery....
-
Interior lights come on when I enter the car, and most of the time do not go out while driving. Once I park the car and remove the key, the lights will go off like they are supposed to. how do fix this problem in an otherwise fabulous car When you get out....
-
I designed and built this stomp-box forGrammy-winning resophonic guitar player Stacy Phillips. Stacy typically uses two transducers on his Dobro-style instruments: a piezo element mounted internally and a gooseneck-mounted electret microphone positioned an....
-
I`m going to show you how to use your Arduino to control up to 12 servos at once with minimal jitter. Using a simple serial interface you can control the position of up to 12 servo channels. Up to 10 snapshot positions can be saved and played back at any....
-
If TIP32C (Q2) gets excessively hot, use an IRF9640 MOSFET instead. Experiment with different values for R6 to find the optimal value (I use a 390 ohm resistor). Temporarily substitute R6 for a trim potentiometer (470 or 1k) to find the optimal dumping....
-
ICla and IClb are wired as a slow astable multivibrator and IClc-ICld are wired as a fast astable. The output of the slow astable modulates the frequency of the fast astable, and the output of the fast astable is fed to the external speaker via the Ql VMOS....
-
-
This circuit is designed to check the condition of lead-acid and gel cell batteries with capacities greater than 20Ah. It switches a load of about 18A at a rate close to 50Hz so that the internal resistance of the battery can be measured using a digital....
-
This little instrument identifies faults in horizontal output stages by doing a `ring` test, i.e. it applies pulses to the LOPT / FBT primary circuit, and counts the number of damped oscillations or `rings` produced. For each `ring` down to about 15% of the....
-
The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small current flows between base and....
-
This disco lamp circuit is not a voice operated switch (VOX) because this circuit is too dumb to differentiate between musical sound or human voice. This is rather a sound activated than voice activated. One interesting application is to control your disco....
-
This is a design circuit for scoring game circuit that can be used for all occasions when a dice is needed. The circuit is based on a NE555 timer, a 74LS192 counter, a74LS247 decoder and a & segment LED display. The timer IC1 will produce the clock for the....
-
Nearly always when a remote control doesn`t work, the underlying problem is elementary: the unit does not emit light. The cause may be dry solder joints, defective LEDs etc. , but also a flat battery (perhaps due to stuck key). The human eye is unable to....
-
-
A form of relaxation oscillator which comprises two stages that are coupled so that the input of one is derived from the output of the other. Basically two amplifiers cross-coupled with regenerative feedback, in it`s most simplistic form. One of the....
-
This circuit is based on mobile phone chargers. These chargers are based on the Motorola MC34063 switchmode IC. By changing the values of the feedback resistors (R1 & R2), the output voltage can be varied over a wide range. Just modify R1 and R2 according to....
-
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency....
-
This LED VU Meter (volume-unit) is capable of monitoring and displaying power levels present at the speaker terminals of an stereo audio power amplifier. The levels are displayed in ten discrete steps using 10 LEDs for each channel. This project is designed....
-
The circuit can be used to tell whether or not an input signal is within a certain frequency range. The device consists of three !Cs, a dual monostable multivibrator, and two dual D-type flip-flops. The signal whose frequency is in question is fed to the....
-
Transistors are finding new and ever-increasing uses. Some of the circuits in which transistors are being applied are well-known through prior employment in conjunction with vacuum tubes. The applications shown in the chapters which follow illustrate some of....
-
Tube Tester and Filament Burn In Jig - Here`s my answer to cooking the tubes for days and then testing them before inserting them in an amp. Note - I have learned an important lesson with this jig. The filament alone heats the entire bottom of this tube and....
-
-
The heart of this circuit is the UM3481 IC which can be powered by a 1. 5 volts battery and can be used for electronic doorbell, toys, melody clock, music box, etc. The UM3481 IC is designed to play the melody according to the previously programmed....
-
Combustible gas alarm circuit is shown. Circuit by the gas sensor, multivibrator and audio output roads. Multivibrator integrated circuit by the NAND gate way inside two NAND g..
-
Circuit as shown with W7805 positive current source application integration circuit composed of the regulator. CKS integrated voltage regulator circuit illustrated W7805 work i..
-
The design of the 40W Valve Amplifier is shown in the figure. In valve amplifiers the predominant feature is the strong presence of the second and third harmonics, sometimes in agreement with the fourth and fifth, but always with a much wider width. Higher....
-
As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....
-
-
Circuit in order to stabilize the lamp brightness L, using thyristor AC automatic voltage regulator circuit. For this reason access thyristor T5 on a diagonal line from the exc..
-
This project allows one to build a very high quality version of the Stax SRD-7MkII headphone adapter to allow one to use an existing favorite amplifier to power your stax headphones. (Let Birgir know what amplifier you have to find out if the adapter is....
-
It is seen from the ring, when vri off, 0 [2 is turned on, the current through RJ, Ci: When VT1 conduction, charging Cl start discharge. Then give cl inverting charge, I voltage becomes positive, vri turned on. So uc: close O, so that VT2 base electrode....
-
With NE555 making push-button delay section lamp circuit shown in Figure 3-5, the circuit from when base integrated circuits, ..
-
Circuit works: The controller consists of a power supply circuit, a control circuit and audio amplifier is composed of three parts. ..
-
Last year, I found a 31 day pendulum wall clock (dissambled) in a box of parts at a swap meet and decided to try and put it together and regulate it with a quartz crystal oscillator. The escapement part that rocks back and forth and drives the pendulum was....
-
This rotative speed regulator circuit schematic allows to control the holing speed of your borer or driller machine. This project is based on the fact tha....
-
The TMS320C5505 EVALUATION BOARD is specially desgined for developers in dsp field as well as beginners. The kit is designed in such way that all the possible features of the DSP will be easily used by the everyone. UART (Universal Asynchronous Receiver....
-
With a constant current excitation, the voltage dropped across an inductance increases with frequency. Thus, an active device whose output increases with frequency can be characterized as an inductance. The circuit yields such a response with the effective....
-
This circuit is a metal detector capable of detecting large metallic objects. at a depth of 2m to 3m. It depends on the size of the object, and often on the type of soil. Construction is very easy to implement even for a beginner. The necessary components....
-
This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications. TX-2B / RX-2B has five channels,....
-
The circuit uses a 555 timer oscillator to supply clock pulses of a variable frequency to the 4017 decade counter. The decade counter only needs to have three outputs so the fourth output goes into the reset pin to start the cycle all over again. The central....
-
The following circuit shows about PC Adapter 12V Circuit Diagram. Features: a current limiting circuit is connected in series with the12V supply, ....
-
The chassis layout has been designed, and the 17" x 14" x 3" steel chassis is ready for drilling and hole-cutting. There`s no backing off now, Dogzilla will live! It`s actually starting to look like a piece of gear. Most of the chassis parts mounted, except....
-
This is a compact three transistor regenerative general coverage receiver with fixed feedback. It`s based on the principle of the ZN414 only much higher coverage. The sensitivity and selectivity is relative good (especially on the LF and MW bands) as can be....
-
When the input voltage is 170-260V AC range, the output AC voltage 187-231V range. Transformer ratio is k = 24/220 = 0.11...
-
This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily (see....