Application of the principle uPC1237H

Posted on Nov 10, 2015

1237H-circuit principle shown in Figure 2-122. Its interior has four separate detectors can finish respectively to their inspection tasks. When the circuit is abnormal, it can

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

immediately drive the relay, disconnect the output circuit, speaker protection and associated circuitry from damage. Relay output drive current rvPC1237H up 80rnA, wherein the overload protection circuit, the midpoint voltage offset circuit protection reset in two ways, one is automatically reset method, namely 3 feet by a 0 - 02t.eF capacitance ground when the circuit failure relay, the relay is automatically released after troubleshooting. Another species is shutdown reset method, namely 3 feet directly to ground, then self-locking function within the circuit, the relay pull once, even if it will not release when the fault disappears after the shutdown circuit must be reset. Two methods has its advantages. When should each use flexibly select oLePC1237H single-supply operation, the operating voltage range is very wide, 25V - 60V between can work reliably. Power protection circuit consists Rzo, R2l, Cll composition (Fig 2-122 R12.Ri l and island), 7 feet for power protection input into the terminal. Vc by, R2l charge to cll after power. Since the time of action C5, the relay in the boot after the delay time remains active until the pre-stage amplifier stage and push into a stable state after the end of the time delay relay release, connected speakers, thus avoiding power impact. Delay time from equation Cii-Rzl-ln [(V8 - V7)/V8] decision, according to the figure number, the delay time of 1.7 seconds. Midpoint offset by the protection circuit Rj4, islands (Fig. 2-122 in people, Q), 2 feet for protection midpoint voltage offset input. Its a positive level detection threshold voltage is 0 - 62V, the negative threshold voltage level detection is a 0.17V. Such a high index, in practical applications can cause frequent movement of the relay, the impact sound effect, so in practice the protection of the electrical circuit path has expanded o overload protection circuit consists Vr5, VT4, Rio, Rl l and R etc. (Figure 2-122 for VTs, VT7, Ri, R2 and Ro), 1 pin overload protection input. When the output overload, the voltage drop across R6 increases, and this will trigger VT4 conducting a VTs conduction, thereby triggering a foot so that relay. Adjusted odds of Rio and can be changed to protect sensitive Rl1 degrees. Shutdown protection circuit from anti- f, RL9 and C12 (Figure 2-122 for f wind, R10, C4), 4 feet for the shutdown protection input into the terminal. Working through the power supply circuit VD7 rectified when the buck by R19, to establish a stable straight 4 feet after filtering C4 stream level. Just 4 feet a loss of power, the relay immediately pull. Since the C12 is much smaller than the capacity of the power supply filter capacitor, so if a shutdown pin 4 immediate loss of power, effectively preventing the shutdown impact o

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

Mp pulse width control

Differential multiplexers are generally used in process control applications to eliminate errors...

Positive Pulse Pulse Stretcher

A simple pulse stretcher built with two sections of an op amp uses voltage follower U1A to drive...

Fast Composite Amplifier Circuit

An ultra-low-noise, low-distortion op ampthe AD797is combined with the ADS 11 op amp, which...

12V Glow Plug Converter

Most small internal-combustion engines commonly used in the model-building world use glow plugs...

Robotics Page

This is just my attempt in making the simplest and kinda smallest photovore. Well, it`s not that...

dc motor driver with h bridge ic l293d

IC H Bridge DC motor driver L298 has two H-Bridge circuit in it, so it can be used to download...

motion motor control servo system block

This is a figure for a block diagram of a modern automated systems incorporate closed-loop...

Op Amp Wien-Bridge Oscillator

The opamp Wien-bridge oscillator provides a nice view into classic oscillator design using...

Flyback Transformer Driver Circuit

Many sites doesn`t provide circuits driving these transformers, they simply say that they are...

RF-AMP Documentation

The amplifier can be used in a number of projects to buffer and amplify outputs from devices such...

556 photoelectron pulse detectors omission

As shown in FIG photoelectron pulse missing detection circuit. The detector consists of...