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

Latch Debouncer Switch Circuit Diagram

on
This is a simple Latch Debouncer Switch Circuit Diagram In electronics latch is a circuit that has two stable states and can be used to store state information. Although this circuit uses a 74HC74, any CMOS variant of this flip-flop will work. IC1A acts as a true/ complement buffer. RI and R2 ensure that IC1A comes out of reset before the clock`s edge occurs. R3 applies IClA`s logic state to pins 1 and 3. When the switch closes, the next logic state stored on the capacitor transfers to the flip-flop`s reset and clock inputs. 

Latch Debouncer Switch Circuit Diagram 

Latch Debouncer Switch Circuit Diagram


Releasing the switch lets the capacitor charge to the next state via R4. IClA`s output is the LSB; IClB`s output is the MSB. Notice that the counter`s state advances when the switch is first pressed, rather than when it`s released; the latter is the case with many other switch-debouncing schemes. You can replace RI with a 22-pF capacitor to reduce the circuit`s sensitivity to parasitic effects. The addition of this capacitor also lets you lower the magnitude of R2 and R3 by a factor of 10.

Comments

Post a Comment