Sawtooth generator circuit a

Posted on Mar 28, 2007

Application circuit is shown in a complementary sawtooth generator. In the figure, the horse is VT1 base current limiting resistor, the conduction time to prevent excessive bas

Click here to download the full size of the above Circuit.

e current flows through the crystal tube VT1 base, R4 transistor VT2 collector leakage current bleeder resistor to ensure when VT2 end, VT1 reliable cutoff. One under normal circumstances, the power island EJ. When the power is Shu Yi cut turned from no charge in the capacitor C, so both ends of the electric voltage is zero (U0-0), then transistor VT2, the emitter potential is zero, the base potential is A potential point, so UA UE. Transistor VT2 off. VT1 base also granted without electricity surges, also in an off state. Power capacitor C is charged through the resistor Rs, with the increase in charging time, E point potential has also been on the rise. When the potential at the point E over A point potential, VT2 into the enlarged area, its collector current flows through the resistor R3 VT1 base, VT1 from the same cut-off and into the enlarged area, the collector current through the VT1 VT2 amplified again VT2 feedback to the base, so that the result of positive feedback, forcing VT1, VT2 are saturated. Capacitor C by saturated transistor VT1, VT2 discharge. With the increase of the discharge time, the voltage of the capacitor C continues to decrease. When the voltage drops to a certain point value E, if the parameters chosen, this time, the base current of transistor VT1 VT1 is not sufficient to maintain saturation, will turn off the circuit by making VT2 positive feedback form for off state, circuit into the second cycle. The output waveform is shown

Leave Comment

characters left:

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

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....
Ultrasonic distance finder circuit

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....
Simple Metal detector circuit with CD4030

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....
Fully automatic watering circuit for flower pots

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....
Simple deep searching metal detector circuit

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....
Sub-Harmonic Bass Converter for Electric Guitars

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,....
Echo Depth Sounding Sonar for Boats

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....
100W HiFi Audio Amplifier Circuit

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....
Plant-Pot Water Level Indicator Circuit

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.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

VGA to TV converter II

This VGA to TV converter is designed to connect VGA card to a television which has suitable...

High drive oscillator-flasher

The driver in the package is connected as a Schmitt trigger oscillator (A) where R1 and R2 are...

Low-power-rs-232c-driver

This circuit draws only 4 mA from a 5-V supply while driving a standard RS-232C receiver. The...

Light-sensitive-audio-oscillator

This circuit"s frequency of oscillation increases directly with light intensity. The greater the...

bikelab report 2 the sun lab and led taillights

This second issue of the Bikelab Notes, published during my time building BEHEMOTH at Sun...

shootable simon game

Here is the schematic for the circuit, including the connection to the piezo hit sensor. For...

NAD C 520

The LCD display on my NAD C520 compact disk player has become unreadable. The audio and CD deck...