Varius Circuits
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The digital sine wave generator (oscillator) circuit has the advantage that only few components are needed to generate signals with high amplitude constants and variable within a very wide range of frequencies. The circuit shown here generates a sinewave.... -
A very simple DIY crystal oscillator circuit which use a quartz for frequency stability and a good rf transistor. Use a 2-nd or 3-rd harmonic crystal, for.... -
THis Wien bridge oscillator is very simple and as every wien oscillator has low distorsion and the resonance frequency can be easily adjusted. This frequen.... -
Nowadays, it is no longer necessary to use discrete components to build oscillators. Instead, many manufacturers provide ready-made voltage-controlled osci.... -
This FM oscillator can be used for wireless audio, microphone and part-15 applications where stable frequency modulated oscillators is needed. Lt can be va.... -
This quartz crystal oscillator circuit has greater stability than a parallel resonance circuit. It generates frequencies up to 30 MHz or even higher if you use BFR91 for T1, T2 transistors and reduce R1 R2 values. The MOSFET buffer insulate the oscillator.... -
here is a pic running 36v 500ma on the front, 36v charging on the back. Brightness is approaching level of a 240v globe, considering its a 20 watt.... -
The frequency is pretty stable as the volts drop. The reason i called it the backwards jt is cause it works best with a bifilar coil and one transistor. and with one tweak to your circuit you can run a battery down to 0. 1 volts. using a 2n3055 transistor.... -
Basic Oscillator (Tone Generator) At 1.8 KHz, IC 555 , Here we have an astable oscillator built around 555, which gives an alarm tone of 1.8 KHz directly driving a speaker. This is basic alarm circuit, whic.... -
An oscillator is an amplifier with a feedback loop from output to input. Barkhausen criteria states that for oscillation to occur the product of the gains around a loop must be equal to or greater than unity and that the sum of the phase shifts around the.... -
The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the.... -
The circuit is presented as a starting point - there will be some experimentation needed for each individual case. For the popular microwave bands the LOs are usually generated from overtone crystal oscillators followed by multipliers, with the following.... -
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The circuit below is a standard oscillator of the Colpitts variety. Similar circuits have been used in many ham radio homebrew transmitters. This particular circuit should function well at frequencies from 1500 kHz to 8000 kHz. For use on lower frequencies,.... -
The open-loop concept of oscillator design is often met with considerable skepticism by engineers familiar with classic oscillator terminology. For comfort consider Figure 2-4A where the oscillator cascade is drawn with only the RF components. Next, the.... -
A popular circuit known as a Hartley oscillator. Its identifiable feature is the tapped coil in the LC tank circuit. Notice that the coil`s tap point is grounded. The amplifier portion of the oscillator is a common-emitter amplifier. Therefore, the ac base.... -
Above is a schematic diagram of a type of audio oscillator known as a twin "T" phase shift oscillator. It gets its name from the phase shift network made up of R3, R4 and C3 plus C1, C2 and R2 which shifts the phase of the signal fed back from the collector.... -
To demonstrate Rincon`s capability to simulate autonomous circuits, let us consider one-transistor oscillator, which uses phase-inverting resonance T-shape LC circuit. Schematic of this simulator is shown at fig. 1. Design of simulator is described in.... -
Feeling chirpy? Attract new friends with this modified hartley oscillator. You could also use it as a replacement doorbell.... -
All sound effects are generated internally by the HT2884 IC. Power is a 3 Volt battery, but the IC will work with any voltage between 2. 5 and 5 Volts. Switch S1 is the on / off switch. The output at pin 10 is amplified and drives a small 8 ohm loudspeaker..... -
This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the circuit diagram, the typical dual-tone sound of Police or.... -
This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape.... -
This multi-tone siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear-catching than a single-tone siren. The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio.... -
Do you long for a beach holiday on a tropical island, but you don t have the necessary wherewithal? We ve got just the answer: build the i-TRIXX surf simulator, put on your headphones, and dream yourself away from this dreary realm. Let the rhythmic rush of.... -
The schematic above illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0. 01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated.... -
Using two gates from a CMOS 4011 NAND chip, a simple Squarewave oscillator can br made. Alternatively a CMOS 4001 chip can also be used, or a TTL equivalent. In this circuit the mark space ratio can also be independently controlled by varying the value of.... -
It is a resistance tuned oscillator covering from 35 cps (frequency unit was the cycle at this time) to 35, 000 cps in 3 ranges. The major problem with such a resistor / capacitor tuned Bridge is to obtain a constant level output over a full decade frequency....
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
Popular Circuits
Here is a telephone line vigilant circuit to guard against mis- use of your telephone lines. It...
I use a 12V 20W halogen lamp (MR16) and a 4. 2Ah SLA battery for my bike light system. The...
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The amplified signal is fed to the melody generator via resistor R5. The output of the melody...
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With DC control voltage of 5 mV to 5 V, circuit controls frequency of both square and triangle...
As shown below, it is a circuit diagram of a portable gas detector. The portable gas detector...
As we all know, if the power transformer neutral line circuit, and when the three-phase...