Schmitt trigger comparator


Posted on Jul 17, 2012

The comparator has an output pull-up resistor RL and is connected up to operate as a Schmitt trigger using the single rail supply Vcc. The feedback resistors Rl and R2 give upper and lower threshold levels VT+, VWxw, respectively. VT+ is easily set by suitable resistor selection but there is little independent choice of VT_ because VT_ cannot exceed VCE(SAX).


Schmitt trigger comparator
Click here to download the full size of the above Circuit.

In Fig. 15-13B current-source, comprising the transistors RE, Rb produces a current I ~: (VEB/RE), VEB ( — 0.65 V) being the emitter-base voltage of Ql and Q2. Fig. 15-13C shows the results of a practical test using the circuit of Fig. 15-13B, and the following operating and component data: Vcc = 5 V; RL = 1 ? ohm; Rj = R2 = 10 ? ohm; RB = 3.6 ? ohm; RE = 1 ? ohm + 10 ? ohm pot; Q1 = ZTX500; Q2 = 2TX500.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Bridge-transducer-amplifier
High-Gain Current Sensor
Dc Millivoltmeter
Production of automatic re-set timer for crime prevention buzzer that uses PIC
Solar Panel Voltage Regulator Charger Circuit
Motor Controller
digital step km counter with



Top