Featured Post

High CMRR Instrumentation Amplifier (Schematic and Layout) design for biomedical applications

on
Instrumentation amplifiers are intended to be used whenever acquisition of a useful signal is difficult. IA’s must have extremely high input impedances because source impedances may be high and/or unbalanced. bias and offset currents are low and relatively stable so that the source impedance need not be constant. Balanced differential inputs are provided so that the signal source may be referenced to any reasonable level independent of the IA output load reference. Common mode rejection, a measure of input balance, is very high so that noise pickup and ground drops, characteristic of remote sensor applications, are minimized.Care is taken to provide high, well characterized stability of critical parameters under varying conditions, such as changing temperatures and supply voltages. Finally, all components that are critical to the performance of the IA are internal to the device. The precision of an IA is provided at the expense of flexibility. By committing to the one specific task of
2

Simple Dual Bell Circuit Diagram

on
This is a very simple dual bell circuit diagram. It is often desirable for a single doorbell to be operated by two buttons, for instance, one at the front door and the other at the back door. The additional button, S2 in series with the break contact of relay Rel, is connected in parallel with the original bell-push, SI. When S2 is pressed, the bell voltage is rectified by D1 and smoothed by CI. After a time, t = R{R2C2, the direct voltage across C2 has risen to a level here T1 switches on. 

 Simple Dual Bell Circuit Diagram


Simple Dual Bell Circuit Diagram

Relay Rel is then energized and its contact breaks the circuit of S2 so that the bell stops ringing. After a short time, CI and C2 are discharged, the relay returns to its quiescent state and the bell rings again.In this way, SI will cause the bell to ring continuously, wliile S2 makes it ring in short bursts, so that it is immediately clear which` button is pushed.

Comments

Post a Comment