Posted on Jul 10, 2012

The range of this ac-voltage monitor is 100 to 140 Vac, with a resolution of 1 V. The speech processor interprets an 8-bit binary input code from an analog-to-digital converter. The processor`s pulse-code-mod ulated output then passes through a filter and an amplifier before driving tbe circuit`s speaker to vocalize the corresponding number. Each time switch S1 is _pressed, the speech-processor program enun ciates tbe monitored voltage readings from 100 to 140 V, depending on the code at the input of a 27C64 EPROM.

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

The voltage-monitoring circuit consists of a bridge rectifier, filter capacitors, and a 10-Kilload resis tor. A divider, RA and RB, limits the input voltage to a maximum 2.55 V. The aid converter, IC4, then sends the voltage reading to tbe 27C64 EPROM, ICS. Pressing Sl sends a negative transient pulse to the write, WR, input of the aid converter, IC4, which initiates a 100-ttS conversion process.

Leave Comment

characters left:

New Circuits



Popular Circuits

Timer LM555 Circuits
Fun with Filters!
preamplifier for ecm microphone
Speed control for PCB drill
U-110 1.5 Mhz Current Mode Ic Controlled 50-watt Power Supply
HT7070A Voltage Detector
A Dozen Small Battery-Powered Alarm Projects
Time relay three-start circuit
Double five-band equalizer circuit