Popular Circuits Page 2
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A real cheap glove interface, that still achieves considerable accuracy while improving the comfortability. Essentially, I purchased a bunch of PowerGloves (PG`s), took out the flex sensors, inserted them in sheaths on a lycra glove and suit, hooked them up....
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digital tachometer & speedometer using seven segment display, but I failed to do it the right way. The circuits I used before were too crowded with ICs & other components. Then I managed to build the LED tachomter. Later, I got a stepper motor & used it as a....
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There are situations in home automation applications where you would like to measure the level of some body of water (e. g. pool, pond). The 1-Wire network makes it easy to interface sensors to a PC or simple controller. Some experimenters use a string of....
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Hello, I`m trying to simulate a 10MHz Colpitts Oscillator using an OPAMP, but i`m not getting the expected outcome, the frequency is not 10MHz and the ....
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Diode D1 and resistor R1 provide the VDD isolation when programming the 24 pin devices. The jumper J3 must be shorted for 24 pin devices, and open circuit for 28 pin device programming. Following EEPROMs are pin compatible with their EPROMs version, We are....
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Originally I intended to have 32 faders. Once I tried fitting them on a veroboard, 32 seemed rather excessive so I have reduced to sixteen. This still allows generation of accurate eigth harmonic which compares well with the Hammond's ninth harmonic. A....
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Isolated flyback converters usually evoke thoughts-or bitter memories-of custom transformers, slipped delivery schedules, and agency-approval problems. Off-the-shelf flyback transformers carry isolation ratings of only 300 to 500V and rarely of as much as 1....
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The ac ringing voltage (typically 40 to 90 V at 26 Hz) is rectified by U1, the tone-ringer IC, and is used to drive ..
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The SSY-1 is a small pulsed Nd YAG laser originally used as part of the laser rangefinder in the M1 Abrams tank. The laser head and PFN-1 pulse forming network (flashlamp capacitor, inductor and diode) are readily available for under $250 as surplus on eBay....
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The 741 op amp integrator signal is fed into the Schmitt trigger input of an inverter. When the signal reaches the magnitude of the positive-going threshold voltage, the output of the inverter is switched to zero. The inverter output controls the FET....
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Controls intervals up to 1 h in 1-s increments as programmed by thumb wheel switches S1 and S2. Circuit is basically two-stage programmed counter driven by 1-s clock derived from 60-Hz power line. A1 is connected as divide-by-60 counter triggered by 60-Hz....
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For the past year and a half I (Mark) have been part of an Ann Arbor, Michigan based group named GO-Tech. The common thread among the group members is that each of us is interested in making things using technology (combining hardware, software, metal, wood,....
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A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old russian radio (2x280pF). I read on the Internet that if you live in an area with strong signals and you want to....
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Figure 1-22 (a) shows the circuit which could convert 0-+lOV input voltage Ui into the pulse with 0 -1OOkHz output frequency, and pin 7 of VFC320 is connected a resistor to directly connect to standard logic. Figure 1-22 (b) shows the the circuit which could....
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As shown in FIG grounds efficient, low-power step-up DC-DC converter MAX761 and a few external components, the + 5V + 12V boost power supply. Its characteristics are: the conve..
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This peak detector uses a CA3100 BiMOS op amp as a wide-band noninverting amplifier to provide essentially constant gain for a wide range of input frequencies. The IN914 clips the negative half of VfN (R4)/(R3) (R5). ..
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It can switch 0-100Hz input frequency to 0 -l0V output voltage. In the circuit, TC4013 is a monostable multivibrator, which could shape and amplify input pulse, and the input pulse width is 1OO?s. TC4013 could trigger VTl to turn on, when the input voltage....
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Logic probe is circuit that indicates the logic state of the node of any TTL logic circuit. It will work if we must supply the probe with the same power of....
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This project is a combination Logic Probe and Logic Pulser. It is capable of testing all sorts of digital and microcomputer projects. You will find it extremely handy when designing a project as the golden rule is to test everything in steps and stages....
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In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in....
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The circuit is not only used for the latch output, but also for non - latched output, SB is control switch. When SB and VDD are turned on, it is in the latch output state, then the sixteen output ends are out control of Io output state; when SB and Io output....
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The driver stage works in the same manner as the class A output stage described previously. However it is only working at a couple of milliamps, so efficiency is not an issue here. The biasing arrangement should be familiar by now. Some sets, including the....
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Figure 2 shows another approach that requires additional components but delivers the full magnitude of the voltage ramp to Pin 3 of IC1 and provides the approximately 1V-dc offset that Reference 1 requires. Transistors Q1 and Q2, resistors R1 and R2, and LED....
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SN75064 ~ SN75067 is a monolithic, high-voltage, high-current Darlington switch output termination..
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The solar-lantern circuit in Figure 1 is a low-loss configuration that uses a 7W, four-pin CFL (compact fluorescent lamp) and a 12V, 7-Ahr, sealed, maintenance-free battery. The inverter features greater-than-85% efficiency, less-than-2-mA quiescent current,....
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The ProfiLab-Expert software allows you to develop your own digital or analogue measuring technology projects. It doesnt matter if you want to create analogue measurements or digital controls - you can realize it all. And for all this you dont have to write....
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Receiver. Output from the transducer is amplified by Ql and Q2, and rectified by Dl. Voltage on pin 2 of ICl will go more negative as the input signal increases. ICl is used as a comparator and checks the voltage on pin 2 (i the sound level), to that on pin....
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What about the 10K resistors at the bases of the transistors, and the 1K resistors at the collectors. Keep those with theTransistors when I move them, orget rid of them If the 10K resistors are not included the transistors will blow-off, without the 1K....
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An extremely simple and low cost Sine/Square wave generator based on the Analog Devices AD9835 Direct Digital Synthesis (DDS) Generator chip. The frequency can be set for any frequency from 1Hz to 10MHz in 1Hz resolution steps! All this with three push....
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There is considerable hiss brought on by the circuit. Cutting the treble knob helps greatly (but no fun with treble cut!). When the vibrato circuit is active, the his is worse. Following these discoveries, I re-capped the board given the schematic values as....
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This is the 6A schematic that was in the bottom of the unit. It is incorrect. These units have been banging around for over 40 years. Many bottoms have been switched around, due to battery corrosion in the lower case. My Geiger Counter is a 6B, and the....
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Silicon controlled rectifiers (SCR) can easily oscillate if there is an inductor (a speaker coil in this case) which gives just enough extra voltage to completely switch off the sustain current. In this way a new cycle may start and oscillations set in. It....
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The herein schematic diagrams TPS61042 Current LED driver powering 8 LEDs with 81% efficiency at 3.6V/18.6mA. TPS61042 used to be applied in applications such White LED Supply for Backlight/Sidelight Displays (PDA, Pocket PC, Smart phones, etc)..
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A flashing light of high brightness and short duty cycle is often desired to provide maximum visibility and battery life. This necessitates using an output transistor, which can supply the cold filament surge current of the lamp while maintaining a low....
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This circuit was designed for use in a hifi showroom, where a choice of speakers could be connected to a stereo amplifier for comparative purposes. It could be used for other similar applications where just one of an array of devices needs to be selected at....
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Designed to feed a low-frequency subwoofer speaker system, the amplifier is capable of up to 100 W into an 8- load. The OPA541BM op amp requires heatsinking and is manufactured by Burr-Brown Corporation. ..
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Pressing the pushbutton of the transmitter, a sound and/or light alert is activated in the receiver. The system uses no wiring or radio frequencies: the transmitted signal is conveyed into the mains supply line. It can be used at home, in any room from attic....
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If you ever wondered why your trailer Stop/Turn signal lamps are so dim you are not alone. The answer is simply that the typical Stop & Turn Signal Convert....
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This is a Very Simple circuit for Lead Acid Battery Charger using PB137 Regulator. The PB137 is used for lead acid battery charger circuit because it can give....
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This circuit was formed to create a wireless alarm from a normal magnetic contact. By fixing the magnet to the leaf of a door, or swing of a drawer, it is easy to reveal the opening. To transmit the signal to a control anti-theft we modify the circuit of a....
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This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked-up by a miniature electret....
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This is a simple 3 band graphic equalizer circuit that`s built by a single op amp IC LF351 IC and few passive components. The component values of this circuit are not very critical and can be replaced with nearest values with a little loss on the....
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The half linear design is simply so you can get away with small thermal considerations, if the linear only needs to handle 1-5w in place of the full 75w per rail. as for the MOSFET to regulate with them means operating them in there linear region, just below....
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This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily....
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In the NIXIE clocks that I have built, I did not want to have the big and ugly mains transformer in the actual clock itself. Instead I use an AC adapter that fits into the mains wall plug. This means that I have to use some sort of an up-converter to....
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This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. When the test button is pressed, the Car battery voltage....
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The dual slope-sampling solar engine. Yet another interesting design from the fertile mind of Wilf Rigter If you had time to experiment with the ALF type SE circuit you may have discovered some of its shortcomings with regard to a Power Smart Head....
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Circuit MVBR traditional two-transistor and other components to provide a simple phase locked loop. TR1 and diodes in the form of logic gate turns on, then half period and the ..
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In this usb circuit using an IC as a modifier of digital voice data into analog so that it can be applied to a headphone, or again through the power amlplifier strengthened so that it can be heard through the speakers. IC used in this circuit using IC....
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Well, it took some time and a few failed attempt, but here it is. A neat project that lets you control two wheels or tracks from your PC serial port with no wires attached. I have it working at 2400 baud and that is about as fast as I can think. We assume....
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A tuned radio frequency receiver (TRF receiver) is a radio receiver that is usually composed of several tuned radio frequency amplifiers followed by circuits to detect and amplify the audio signal. A 3 stage TRF receiver includes a RF stage, a detector stage....
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A simple level of power meter can be arranged to give a bar or dot display for a hi-fi system. Use green LEDs for 0 to 7; yellow for 8 and red for 9 to indicate peak power. The gain control is provided to enable calibration on the equipment with which the....
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For our second build in the Make It Last Build Series, we`re constructing a robotic plant. This week, we`re going to put together the brains of the machine, which we will use in the coming weeks to bring our plant to life. This basic circuit will have....
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Nowadays the batteries are gaining more and more power, being the only components that fail to provide energy for portable electronic devices. The evolution is rapid, leading manufacturers electronic equipment to attempt to minimize the consumption of their....
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Here`s a design circuit that has function that it will help to filter out the interference signal and ensure that the signal received from the Morse code station stand out. This is the figure of the circuit; The earliest mode of radio communications is the....
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The JFET Pierce oscillator is stable and simple. It can be the clock of a microprocessor, a digital timepiece or a calculator. With a probe at the output, it can be used as a precise injection oscillator for troubleshooting. Attach a small length of wire at....
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The metal detector circuit is shown here that the limits represent the sake of simplicity for a metal detector, but the design works remarkably well. It only uses 40,106 Hex Schmitt inverter IC, a capacitor and a search coil and of course batteries. An....
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Here is a simple low power audio amplifier circuit that can produce a power output of 1W. This mono amplifier circuit is build on LM386 IC which works great on low voltages even below 9V. This low voltage amplifier is useful to amplify weak sound signals....
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In these applications, a pulse input at % is differentiated by a C-R network and the negative-going edge at pin 6 causes the input comparator to trigger the timer circuit. Just as with a V-to-F converter, the average current flowing out of pin 1 is IaverAGE....
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This is an area that is dominated by commercial information resellers. One outstanding exception is Nostalgia Air, which has a growing data base of radio schematics. Some of the links here point to Nostalgia Air `s database, but if you can`t find it here,....
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This is a very simple circuit utilising a 555 timer IC to generate square wave of frequency that can be adjusted by a potentiometer.
With values given the frequency can be adjusted from a few Hz to several Khz.
To get very low frequencies replace the....
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Back in May 2002, we (Silicon Chip) presented the "Battery Guardian", a project designed specifically for protecting 12V car batteries from over-discharge. This unit has proven to be very popular and is still available from kit suppliers. This new design....
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The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition transformer from automotive engine. A fly-back transformer is possibly usable too. The 4049 will drive the....
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The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
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The figure illustrates a reversible de motor drive application with adjustable speed control. The D inputs for these drivers are complementary and can be tied together and driven from the same logic control for bidirectional motor drive. The enables are....
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Build a preamp that I want to use to take a 1/4" keyboard line level signal and drive a Leslie 147 amplifier with it. I want to build the preamp using a 12AX7 and 12BH7 based on the design of a Hammond Organ preamp. Here is the schematic to the Hammond AO-28....
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Using a Burr-Brown VFC 32 IC, this voltage-to-frequency converter uses few components. The circuit values ..
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A wonderful diy gsm jammer otherwise cellular mobile phone jammer schematic diagram instead of application single taking part in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 cellular cell phone meet people is made use of by USA, Canada and....
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This circuit is a general-purpose 10-W audio amplifier for moderate-power PA or modulator use in an AM transmitter. With higher voltages and a change in bias resistors, up to 30 W can be obtained. The Output Stage Amplifier using transistor 2N3055 and MJE2055...
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The Analog Devices ACP3610 is a voltage doubler that works with a switched-capacitor converter, using the push-pull principle. The switching frequency at the output is approximately 550 kHz. The term push-pull` refers to the two charge pumps, which work in....
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The AT90S1200 RISC Microprocessor (AVR family) is a very neat component to program a PLL synthesizer or for doing other rather trivial tasks in a radio circuit. It is reasonably cheap, easy to program and a nice integrated development environment is....
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This is an image Schematic. No Description available...
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The LM317 is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
programming resistor (R1) should be connected as close to
the regulator as possible to minimize....
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A variable resistor provides a voltage input to the PIC which is converted to a digital value using the onboard Analogue to Digital convertor, this in turn is used to set the PWM duty cycle. Since the PWM duty cycle is adjusted using a voltage signal input....
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The LED Torch is based on a 7555 timer running in astable mode (do not use an ordinary 555). A white LED (Maplin order code NR73) produces 400 mcd light output, which, when focussed, can illuminate objects at 30 metres. Try Conrad Electronic for what appears....
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The dc values of op-amp offsets can`t always be taken for granted when delivering ac outputs. No device is ever exactly symmetrical for maximum positive slew rate versus maximum negative slew rate. Consequently, there is always some range of output slew....
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In order to switch some floodlights by my Arduino, the small switch circuits I built around a 39mf22 were just not man enough to handle the current ne....
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That metal detector circuit uses LC single-tube oscillator circuit, it is shown as Figure 8-73. In the circuit, V is oscillating tube, L is the detection coil, Cl is the resonant capacitor. After turning on power switch S, the LC single-tube oscillator....
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The probe described here was designed to be used over the range of several tens of Hz to a couple MHz with currents from a few tens of milliamps to about 10 amps peak-to-peak. Formulae are give which will allow you to create a design suitable for your own....
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How to make a binary clock using a PIC microcontroller using multiplexing to drive an LED matrix....
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This digital-to-analog converter (DAC) integrated circuit is designed for lowest noise performance, both radiated and conducted noise. A recommendedconnection diagram for the ADV7123 is shown in the following schematic diagram. According tothe ADV7123....
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4013 pairs of D-type flip-flop in the astable multivibrator is used as a binary divider output, will produce the output frequency of the multivibrator frequency symmetrical hal..
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The LT®1785 and LT1791 RS485/RS422 transceivers
with ±60V fault tolerance solve a real-world problem of
field failures in typical RS485 interface circuits. Modems
and other computer peripherals use point-to-point RS422
connections to support higher....
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Powered with solar panel, the circuit will give you 5V pure regulated DC voltage. The circuit is made up of an oscillator transistor as well as a regulator transistor. The solar panel charges the battery when sunlight is bright enough to generate a voltage....
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This is a circuit of a microcontroller AT89S52 thermometer and LTC1298 12-bit ADC, programs written in C language program with digital filtering and interface the LED display. Reading provides a sensitivity 0. 1C. The hardware block and circuit diagram is....
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The tuned circuit consists of a variable capacitor and fixed air spaced coil. For the coil, I wound between 10 and 20 turns of wire on an empty tube of around 1.5 inches diameter. The turns were spaced so that the overall length was around 3 inches. The....
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Many countries have 115 volts mains supplies. This can be a problem if your electric shaver is designed for 220/240 volts only. This simple rectifier voltage doubler enables motor driven 240 volt shavers to be operated at full speed from a 115 volt supply.....