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4 Band Resistor
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Total Found: 233
Mini transistor Transmitter 50mW schematic
Is this a transmitter? Medium-wave short-wave consists of three transistors. The transistor AF115, along with the rest of its circuitry, is the oscillator of the device. The circuit of the two OC72 is the low-frequency amplifier (modulator), which forms the carrier wave produced in the circuit of the AF115 lamp from its secondary transformer T1....
200 meters remote control schematic design
Early transmitters use more LC oscillator frequency drift is more serious. SAW devices appear to solve this problem, the frequency stability of the crystal substantially the sa
Crystal oscillator and frequency divider 74LS04 schematic
Crystal oscillator and frequency divider (74LS04) circuit diagram:
This counter uses a four-digit display, but with a flip of the range switch, it can display frequencies from 1 to 40 MHz, with a resolution of 100Hz. The MM74C926 CMOS IC contains a four-digit decimal counter that can latch a given count and then use this information to drive a 7 -segment, common-cathode multiplexed (MUX) display. The block...
6.5Mhz Vfo Circuit
Fixed-value capacitors are disc ceramics. CI, C4, C5, C6, and C8 are NPO ceramic or polystyrene. C2 is a 25-pF ceramic trimmer and C3 is a 15- pF miniature air variable capacitor. The resistors are -W carbon film or composition. The RF chokes are miniature Mouser Electronics No. 43LR103 units. For LI, use 32 turns of #28 enamel wire on an...
10M Dsb Qrp Transmitter With Vfo Circuit
The three schematics represent three building blocks for a 10-meter SSB transmitter. Or these blocks can be used separately as circuit modules for other transmitters. The VFO board uses an FET transmittal oscillator, the VFO signal is mixed in an NE602 mixer and is amplified by Q2 to a level sufficient to drive an SBL-1 mixer in the transmit...
Acoustic Field Generator Circuit
Referring to the simplified schematic in A, the AFG is made up of 10 relatively simple circuit elements. ICl-c and ICl-d arc configured as unity-gain noninverting buffer amplifiers. The summing (L+R) amplifier, IC2-c, combines equal amounts of the left and right signals, via R14 and R15, to develop a total composite signal. Left- and...
Video Line Bar Generator Circuit
A 555 and a dual 556 timer generate a rudimentary video signal, as shown in the schematic. The first timer generates 4.7-8 synch pulses operating in the astable mode with a 64-8 period. The second timer generates a delay pulse, which triggers the third timer to generate a bar,
U1a is an oscillator and U1b tbe measurement part of tbe circuit. It converts unknown capacity into a pulse-width modulated signal the same way anÂ·automotive dwell meter works. The meteris linear so tbe fraction or percentage of time that tbe output is high is directly proportional to the unknown capacitance (CXin the schematic).
The programmable multiple output generator provides the control signals for data converter ATE. Major performance criteria are simple, interfaces to a number of microprocessor systems, low power consumption, stable output timing relationships combined with a minimum of board space. For schematic simplicity only, one output circuit is shown in...
2Mhz Frequency Counter Circuit
This is a schematic and block diagram of a 2-MHz frequency counter. It uses and LSI counter/display driver, LCD readout, and a few logic chips for timebase and timing pulse circuitry. Q2 and Q3 form a signal (input) amplifier. The circuit contains a crystal oscillator built around U3- c and XTAL1, which provides the primary timing-reference...
Voice Disguiser Circuit
A complete schematic diagram of the voice disguiser is shown. Microphone MIC1 picks up the voice signal and feeds it to an audio amplifier, consisting of Ql and Q2, and a few support components. The amplifier has a low-pass gain response that limits the voice frequencies to 5 kHz or lower. The voice signal is then fed to the input of the first,...
Based on Bluetooth wireless transmission-reception circuit design schematics
Circuit Principle: Using LC oscillator frequency drift is more serious. SAW devices appear to solve this problem, the frequency stability of the crystal substantially the same,
Discrete components stereo encoder circuit diagram
Circuit schematic diagram IC1-4069 the Y1, Y2 to form a frequency 76KHZ oscillator, Y3-Y6 isolation after shaping into the IC2 CD4027 dual JK flip-flop consisting of two compon
Frequency counter Oscillator schematic
The oscillator provides a 1MHz and a 1khz clock. The 1MHz clock is used as the clock for the microcontroller and as timebase for millisecond measurement. I use a 2MHz and divide it by 2 in order to guarantee a 50% duty cycle. Then three halve HC390 are used as divider by 1000 which can be externally reset. This is necessary to make sure the millis
GSM Phone Jammer Circuit Schematics
It is based on NE555 as simple noise-maker whose output is fed to a single transistor oscillator. The oscillator is designed to operate between 800MHz and 2GHz which happens to be the frequency span used for GSM phones. The frequency of operation is set with a trim-capacitor. Ovaj bi do 30 metara, a ovaj drugi bi da mu neko javlja na mail. Ne...
Wireless Headphones Transmitter Circuit
This wireless headphones transmitter assures a quality reception over 2 meters. The oscillator frequency is between 1750KHz and 3500KHz and for antenna we..
Oscillator circuit schematic
This web page describes the radio transmitter unit that flew aboard the Cirrus One rocket in April 2001. The intent of including the transmitter as payload was to: As the Cirrus One rocket was expected to achieve an altitude that would be well out of visual range at 10, 000 feet (3 km. ), it was felt that there could be recovery difficulties if the
AM Radio Oscillator Driver
10 MHz to 1 GHz Oscillator
Nowadays, it is no longer necessary to use discrete components to build oscillators. Instead, many manufacturers provide ready-made voltage-controlled osci..
Feld-Hell electronic circuitry and schematics
The 900 Hz tone is generated with an LC-oscillator. The "L" part of the "LC" is provided by the inductance of the oscillator`s output coupling transformer T1. It is a variation on one of the two standard Hartley oscillator configurations (named after its inventor Ralph Hartley, who was awarded the patent in 1920). It has two series-connected (and
HEAT SENSOR image
This simple circuit senses heat from electronic devices and gives warning alarm. It is an ideal add on circuit to monitor heat in CD players, Amplifiers etc. The circuit uses 14 stage ripple free binary counter IC CD 4060. It has an internal oscillator and its frequency is set by C1, VR2 and R2. Reset pin 12 of IC determines its working. When pin1
whistle responder schematic circuit diagram
This device beeps intermittently for about two seconds when a person in a range of around 10 meters emits a whistle. The first two inverters contained in IC1 are used as audio amplifiers. IC1A amplifies consistently the signal picked-up by the small electret-microphone and IC1B acts as a band-pass filter, its frequency being centered at about...
smoke detector alarm schematic re46c140
Using the RE46C140 circuit can be designed a very simple smoke detector alarm using few external electronic components. The RE46C140 IC is a low power CMOS photoelectric type smoke detector IC that will provide all the required features for a photoelectric type smoke detector project. An internal oscillator strobes power to the smoke detection c
1.2GHz Voltage Controlled Oscillator With Linear Modulation
Since high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim ( has produced an integrated 1. 2GHz oscillator, the MAX2754. The center frequency is set using the TUNE input, and a linear modulation input allows the frequency to be modulated. The IC is available in an 8-pin µMAX package, operates from a supply of be
wien bridge sine wave oscillator circuit using lm107
This circuit is that the traditional tungsten filament lamp amplitude regulator is eliminated along with its time constant and linearity problems. In addition, the reliability problems associated with a lamp are eliminated. The Wien Bridge oscillator is widely used and takes advantage of the fact that the phase of the voltage across the parallel b
500-kHz fm oscillator circuit simplified schematic digram
555 Tone Generator Circuit (8 ohm speaker)
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 directly from the 555 (limit = 200 mA). A small capacitor is used at the transistor base to sl
Switching Supply In Telephone Ring Generator
The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high voltage, 1 amp transistor) and a driver transistor (2N3053). The inductor should have a low D
150-Hz Oscillator/Counter Circuit. Simplified Schematic Diagram
1-kHz/10-kHz oscillator circuit card schematic diagram (assembly A3)