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Circuit Diagram
Inverting Amplifier:
The op-amp is connected using two resistors RA and RB such that the
input signal is applied in series with RA and the output is connected
back to the inverting input through RB. The noninverting input is
connected to the ground reference or th
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Description. The circuit shown here is of a simple 0 to 9 display that can be employed in a lot of applications. The circuit is based on asynchron...
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Speed-limit Alert Circuit
Wireless portable unit
Adaptable with most internal combustion engine vehicles
Circuit Diagram
Parts:
R1,R2,R19 1K 1/4W Resistors
R3-R6,R13,R17 100K 1/4W Resistors
R7,R15 1M 1/4W Resistors
R8 50K 1/2W Trimmer Cermet
R9 470R 1/4W Resistor
R10 470K 1/4W Resistor
R11 100K 1/2W Trimmer Cermet
18 Stage LED Sequencer Circuit
Description
The question sometimes comes up of how to cascade 4017 decade
counters for more than 10 sequencial stages. The LED sequencer below
shows a possible solution using a few extra parts.
When power is applied, the 15K resistor and 10uF cap at pin 15
will reset the counters to th
Multitone Siren Circuit
Description
This multi-tone siren is useful for burglar alarms, reverse horns, etc.
It produces five different audio tones and is much more ear-catching
than a single-tone siren. The circuit is built around popular CMOS
oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4
Midnight Security Light Circuit Schematic
Description
Most thefts happen after midnight hours when people enter the second
phase of sleep called ‘paradoxical’ sleep. Here is an energy-saving
circuit that causes the thieves to abort the theft attempt by lighting
up the possible sites of intrusion (such as kitchen or backyard of y
Pulse Width Modulation DC Motor Control Circuit
Description
Often, people attempt to control DC motors with a variable resistor or
variable resistor connected to a transistor. While the latter approach
works well, it generates heat and hence wastes power. This simple pulse
width modulation DC motor control eliminates these probl
Sound Effects Generator Circuit
Description:
This circuit uses a UM3561 IC to produce four different sound effects.
Circuit Diagram
Notes:
Nothing too complicated here. The IC produces all the sound effects, the
output at Pin 3 being amplified by the transistor. A 64 ohm loudspeaker
can be substituted in p
