Popular Circuits Page 163
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Two inverters, one resistor, and one capacitor are all that is required to make a HC(T)-based oscillator that gives reliable operation up to about 10 MHz. The use of two HC inverters produces a fairly symmetrical rectangular output signal. In the same....
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Developing a battery switch-over circuit which is made of two lanes of the depicted circuit. Operation voltage range is from 3V. 12V. Only one lane should be enabled at a time which is governed by logic not included in the schematic. Each lane can....
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The documents, software, tools and links are provided to enhance the ability of an electronics student, hobbyist or professional by sharing information. The information, links etc. should be used by the website visitor, at his or her own risk and....
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TCA440 is a AM receiver circuit for LW, MW and SW in battery and line operated radio receivers. It includes an RF prestage with AGC, a balanced mixer, sepa....
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This circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence of an audio waveform. It can also be directly connected across loudspeaker terminals used as a peak indicator. If you need to monitor some audio signal at a....
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This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN medium power transistor which also provides more current than can be obtained....
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This is a simple ultrasonic mosquito repeller circuit diagram. The circuit is design on the theory that pests like mosquito can be repelled by ultrasonic frequency around (20KHz-25KHz). This ultrasonic mosquito repeller circuit is based on a single CMOS IC....
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Person see the website wants DC Volt adjustable Regulate 1. 2V to 12V current 1-2A sizes at the first stage me think will choose the circuit that use IC LM317. But he tells have IC LM723 the many. Then of this circuit better which this easy circuit, use....
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In this one, servo is programmed to be controlled by two buttons, one turns servo to the left and the other one turns it to the right. When the servo is turning, corresponding LED will be switched on to indicate the operation. Because Arduino has built-in....
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This circuit shows about Remote Control Using Radio Telephone Circuit Diagram. Features: used to switch appliances from any distance, overcoming ....
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Tesla radiant energy collectors and the means of creating those apparatus. I have been working on some radiant energy designs myself, having tried the standard rectification bridge for antenna and ground, to using a greinacher voltage quadrupler rectifier,....
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This add on circuit can be attached to the solar charger to see whether the battery is charging or not. It lights a Red LED to indicate that the battery is....
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This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone. It is connected permanently to the 12-volt supply and its....
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The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit diagram and power....
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This infrared detector circuit uses a passive IR-detector component PID20. It converts heat radiation into electrical impulses. The output voltage of the PID20 increases when an object comes close to it, this object must be warmer than the surroundings. The....
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This simple receiver AF amplifier can supply several hundred milliwatts to an 8- speaker. The gain is about 200X. If..
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Here is the design of an audio oscillator that runs at approximately 1 KHz. I don`t remember where I got this circuit, probably from EMFRD, since Wes`s book is a treasure trove of useful circuits. This handy oscillator can be used as a source of audio for....
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This experiment is more of an introduction to the 4511 decoder/display driver IC than it is a lesson in how to "build up" a digital function from lower-level components. Since 7-segment displays are very common components of digital devices, it is good to be....
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Component selection and installation requirements and general as full complementary symmetry amplifier. T should be noted that the two second diodes should be used in high-freq..
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Use the Maxim MAX292 switched-capacitor filter IC to round a square wave into a sine wave; the circuit`s frequency range is between 5.2282 Hz and 8928.6 Hz when the microcontroller is operating at a 16-MHz clock frequency..
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This switching power supply circuit diagram is based on the MC33374 high power voltage switching regulator IC manufactured by Motorola Semiconductor. This MC33374 switching power supply circuit will provide a maximum output power around 90 W and require few....
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As a followup to my VCR Pong project, here is a gadget that is actually useful in the Real World! It superimposes the time of day, in "HH MM SS" format, in the bottom right-hand corner of an existing video signal. My friend Scott uses it with his home....
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The circuit lowers this dissipation after actuation by applying less than the normal 5V operating voltage. Note that the voltage required to turn a relay on the pickup voltage is greater than the pickup voltage required to keep in on the dropout voltage. The....
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Using white LEDs for illuminating our homes is becoming popularnowadays, due to the high power efficiency involved with these devices. The diagram shows a straightforward configuration involving many LEDs, arranged in series and parallel. Refrring to the....
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The LM35 series that is used in this project is a precision centigrade temperature sensor, which has an analog output voltage. It has a range of -55 C to +150 C and an accuracy of ±0. 5 C. The output voltage is 10mV/ C. The output voltage is converted by the....
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This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (s....
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In this circuit a standard op-amp is wired as an astable multivibrator. The output is non-symmetrical but has the advantage that the timing is controlled by only 1 resistor and capacitor, in this case, the 100k variable resistor, U2 and 100u capacitor C1.....
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Linear regulators are easy to implement and have better noise and drift characteristics than switching approaches. Their largest disadvantage is inefficiency: excess energy dissipated as heat. Several well-known techniques are available to minimize the....
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When SI is depressed, an initial positive voltage is placed on C2 and the noninverting terminal of Ul. The circuit o..
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PBUS is an RS485-like multi-drop bus for interconnecting PIC and other microcontroller-driven devices. Protocol and software is written by Jap. Just include a separate pbus library file into your project and add your command handlers for the specific device....
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700W Amplifier Adjust the amplifier power 700W looks calm, but we requirement not put out of your mind to the adjustment happening forcing transistors, the whole relating to-engagement of frequency offset. It is compulsory to change the current insurance....
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IC1 forms a differential amplifier for the electromagnetic pulses generated by the engine sparking-plugs, picked-up by sensor coil L1. IC2A further amplifies the pulses and IC2B to IC2F inverters provide clean pulse squaring. The monostable multivibrator....
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Completely safe operation is guaranteed due to protection against DC and AC short circuit between all pins and ground, thermal over-range, load dump voltage surge up to 40V and fortuitous open ground. ..
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This transceiver has a 3-stage transmitter and a direct-conversion receiver. Ql is the transmitter"s oscillator, an..
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This circuit provides sine and square wave at frequency of below 20Hz up to above 20KHz. The benefit of this circuit diagram is that you can adjust the output frequency by varry the variable resistor of R6. ..
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Anyone know how I could make an led come on when it gets dark automatically?I made a version with a relay and photoresistor that worked but then I was think won`t that drain the battery to much?I`m trying to use this in conjunction with a circuit I got from....
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Analog Devices 1831 to produce strain gauge signal conditioning ICs, contains an internal low drift input 0. 25V, V/qC (RTI, G 1000), excellent linearity (maximum 0.005%), low ..
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The 555 Ic is wired as an astable and the frequency is constant and independent of the duty cycle, as the total resistance (R charge + R discharge, notice the diode) is constant and equal to 22Kohm (givin a frequency of about 1Khz, notice the hum). When the....
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Using a triangle wave and a comparator, a pulse-width modulated signal can be created. We will use the DAC as our input signal and the resulting output signal will have a duty cycle that is proportional to the input voltage. We will then use the PWM signal....
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The Stereo Tape Head Preamplifier kit is based on LA3161 IC from SANYO. Power supply - 9 ~ 12 VDC @ 20 mA. Output power - upto 200 mW. Input Resistance - 100 K? (Typ), Load Resistance - 10 K? (Typ). Low noise, good ripple rejection owing to the on-chip....
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Cadmium sulfide photoresistor CD1 fingertip can be detected through the filter, CD1 form the sense amplifier feedback network, a part of the sense amplifier ICA produces weak s..
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Having to use the infrared remote control, we will procure in addition to modulate the Nutchip infrerossi receiver. Do not let the name fool you, because more than one module component that looks like a large transistor. We use as a reset Nutchip external RC....
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This pulse generator can supplement a standalone pulse generator. Using a transistor and a 555 timer, pulse widths of 5 to 500 can be produced. The value of C3 is approximately found from the formula: C3 uF = 1.1 x10-5 T where T is the shortest pulse....
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Making a light-dimming control system for a 240V heat lamp dissipating around 250W. I need to adjust the heat output on the lamp by control from a microprocessor. I`m developing on an 8051-based SoC with RF circuitry and some sensors and actuators. Basically....
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A fan regulator circuit which can also be used as a simple lamp dimmer circuit.This fan speed regulator or light dimmer is based on power control using triac....
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Charging is accomplished with a constant current of 60 mA for AA cells to a cutoff voltage of 2.4 V per cell at which point the charge must be terminated. The charging system shown is designed for multi-cell battery packs of 2 to 6 series-connected cells or....
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Electric start and stop the timer circuit diagram shown in the following cycle, LM555 adjustable duty cycle when the base integrated circuits multivibrator, the C3 charge-disch..
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Enter values for R1, R2, and C and press the calculate button to solve for positive time interval (T1) and negative time interval (T2). For example, a 10K resistor (R1) and 100K (R2) and 0. 1 uF capacitor will produce output time intervals of 7. 62 mS....
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This design is based on that of Andrew Bruno. His design appeared under the name of "bruno-if". My contribution was to provide Postscript files for a Printed Circuit Board. This circuit is quite old and goes back to the days of NMEA-0180 and 0182. Note that....
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The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. Circuit to Connect Telephone....
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Combine the SATL and SAVL together. The schematic was updated with the voltage sensing circuit, I added in a Mosfet so that we only draw power from the voltage source when needed and you`ll notice there are 2 jumpersTemp and Volt. You can switch between....
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File alarm with LDR sensor. The sensitivity of the circuit is dependent upon the distance between bulb and LDR as well as setting of preset VR1. Thus by putting the bulb and the LDR at proper distances, one may vary preset VR1 to have optimum sensitivity.....
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This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It has two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
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This is the cheapest 150 Watt amplifier circuit you can get, I think. Based on two Darlington power transistors TIP 142 and TIP 147, this circuit can deliver a blasting 150 W Rms to a 4 Ohm speaker. Enough for you to get rocked, then try out this. TIP 147....
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The FAN5607 Evaluation Board is a compact circuit including the FAN5607 HMPX in a 4x4 MLP package and two 4.7uF capacitors which can provide stable input/output current for up to four of Fairchild s super bright white LEDs...
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A solar charger for an iPod is no more difficult than making our Solar battery charger. Built in iPod batteries are 3. 7 Volts with the capacity (measured in mAh) dependent on the type of iPod - e. g. 1, 200mAh for a 2nd Gen, 850mAh for a 3rd Gen, 500mAh for....
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Simple voltage probe circuit shown in the schematic diagram below very useful in testing, testing, or troubleshooting discrete or integrated circuits,....
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This circuit is based on a very old application note from exar, in this the frequency is fixed by IC1 and IC2 -P1 controls the duty cycle. you need to compute the R and C values to get what you need, LM555 data sheet. You have to study the circuit and do....
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When turning a computer on and off, various peripherals (such as printers, screen, scanner, etc.) often have to be turned on and off as well. By using the....
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3F155 circuit shown in FIG. It uses manual control mode. The figure, a self-excitation braking phase, the other two phases using short brake. Resistor R, the voltage across cap..
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Rice cooked rice cooker notification circuit works: When the rice cooker to work, A, B both ends voltage is 0, the entire circuit does not work. When the rice cooker boiled dry, the master switch trip, then A, B both ends ..
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A MAX634 inverting regulator is combined with a MAX630 to provide a dual tracking ±15 output from a 12-V battery. The reference for the -15 V output is derived from the positive output via R3 and R4. ..
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The µA2240 may easily be configured as a programmable voltage controlled timer with a minimum number of external components. The modulation input (pin 12), which allows external adjustment of the input threshold level. A variable voltage is applied from the....
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Commonly used for camera or computer with B/W TV connection, the bandwidth of the amplifier gain of 3 and having 10MHz. ..
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A portable FM transmitter that can be used to replace a FM microphone. This simple transmitter operates from a 9V battery as shown above. I personally built this for a purpose. This is how it happened:- "members of my singing group find it difficult to....
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Electronic Winder points manual, electric, semi-automatic winding machine variety, this example describes a winding machine with electronic counting feature that lets users coi..
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The circuit consists of three stages, an electret microphone, an audio amplifier and an RF oscillator.
The electret microphone consists of only two parts - a FET transistor and a plastic diaphragm. There is nothing else inside the case. The 3-leaded FET has....
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This circuit has the CMOS IC doing double-duty performance. The first two inverters operate as a digital audio oscillator; the third operates as a low-gain linear audio amplifier. As the intensity of the light falling on photoresistor LDRl increases the....
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It is a 32 Channel, 40Mhz, fully PCcontrolled TTL/CMOSlogic analyser with internal/external triggering and trigger delay. Internal triggering is fully maskable (High/Low/Don`t Care) on all 32 channels. The whole things fits on one single sided PCB with....
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A 12 volt relay is connected between the two stages in a way as when it will get 12 volts from the supply it will get activated and disconnect the 3 volt DC supply from the melody circuit and in the opposite condition when mains power is absent it will....
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Circuit shown in Figure 3-27. Jog feature is available for fine adjustment of moving parts. Figure, SB3 and SB4 are forward jog and reverse jog button button. When you press th..
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The transmitter output drivers present a low impedance to inbound surges and must be able to drive sufficient current in the primary of the transmit transformer in order to produce the required output pulse at the network interface. The receiver inputs....
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For the receiver circuit and display modulewill receive the high frequency AC power cordand decode out to be the actual temperature figures with digital IC No. CD4553 Three-digit BCD Counter IC) and IC-CD4511 (BCD-to-7-Segment Latch / Decoder / Driver IC).....
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A suitable method to sense when some LEDs in my Garage Door Opener are on. A power source (perhaps the same as Vout below) runs to a 1. 5Kohm resistor which runs to 6 LEDs then a transistor of some sort. The transistor is attached to ground and pin 7 on a....
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Diode, D13, provides different timings for the forward sweep, and the retrace which can be faster than the forward sweep. Outputs are generated to tell the blanking circuit when to blank the CRT and when to unblank the CRT. The sync trigger input provides....
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Information about building a small radio transmitter, which has a PCB 1. 75" x 2. 5" (45mm x 68 mm) and has a range of about 30 yards or so. The documentation with the circuit says the freq range is 100-108 MHz, but I have found it to be more like 85-100....
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This sensor switch circuit has nine channels and consist of only three integrated circuits and some resistors. Due to high input impedance, 74HC147 allows to use of 4. 7 M resistors to create a logic level "high" to sensor inputs. When one sensor is touched,....
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I`ve decided on a project for the new year that is ~~less likely to lead to sterilization~~ better than my old project (which was a homebrew x-ray mac....
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Need more current If you`ve got a larger motor waiting to be used, the Pololu High Current Motor Driver Board 14A 6V-16V is just what you need. Connect three digital lines to your microcontroller (five if you want error condition feedback), and you`re ready....
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The circuit is based on a low noise, high gain two stage PNP and NPN transistor amplifier, using DC negative feedback through R6 to stabilize the working conditions quite precisely. Output level is attenuated by P1 but, at the same time, the stage gain is....
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The hardest part of the build was to find and / or design a circuit that could handle the load and still stay with in my budget. This little circuit does both. It varies the power output with one potentiometer (variable resistor) R1. R1 is a panel-mount pot....
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Adjustment potentiometer RP, can change the sensitivity of the device. Capacitors Cl as an anti-light interference of instantaneous action. ..
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The circuit uses two 2N3819 FET`s in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station.....
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A high voltage step-up DC power supply using adjustable flyback conversion...
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This circuit will flash a string of LED's, typically 16, with direct connection to the mains and with a period adjustable between 1 and 4 seconds depending on the setting of the 22K/1W pot. Operation at 110V should also be possible but has not been tested.....
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A simple proximity detector (sensor) circuit diagram and schematic is shown and how to make it using proximity detector IC CS2009A-used for metal detector applications....