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Audio
Headphones with Noise-Canceling Feature
Audio Mixer with 3-Channel Input
STK4050 Audio Amplifier with 200W Output
Graphic Equalizer with 5-Band Capability
MOSFET Audio Amplifier with 60W Output
Mini Amplifier with 2 Watts Output
Mini Audio Amplifier with MOSFET Technology
Preamplifier Guitar Control Circuit
Battery Powered Portable Amplifier for Headphone Use
Bass Boosting Audio Amplifier
Audio Power Indicator with 6 LED Bars
Audio Generator of Bells Ringing
Tone Adjustment Feature of Stereo Preamplifier
60 W Power Amplifier for 8 Ohms Load
45 Watts Audio Power Amplifier Using HEXFET Technology
Graphic Equalizer with 10 Bands of Frequency
8 Watt Output Power Amplifier by TDA2030
Class A Power Amplifier with 60 Watts Output
3 Band Graphic Equalizer Circuit
Modular Buffer Preamplifier in Class A Operation
Linear Phase Response From 3-Way Crossover Circuit
Three ECC83-Based Tube Phono Preamplifier Circuits
Audio Volume Unit Meter
50 Watts Audio Power Amplifier
Class A Modular Preamplifier with Single Integrated Circuit
LM391-Based Power Amplifier with 35 Watts Output
Class A Power Amplifier with 40W Output
Balance Input for Microphone Line
Class A-Designed Symmetrical Audio Preamplifier
UAA180 Based VU Meter
30 Watts Small Power Amplifier
FET-Based Audio Power Amplifier with 12W Output
Loudspeaker Time Delay with DC Protection
300 Watts Output High Power Audio Amplifier
Class A-Designed Headphone Amplifier Using BC308 Transistor
Stereo Mixer for Microphone with 2 Channels
8-Ohm Power Amplifier with 60W Output
HEXFET-Based Medium Power Amplifier with 65W Output
TDA2005-Based 4W-8W Stereo Power Amplifier
ECC88-Based Hampton Tube Preamplifier
Graphic Equalizer Circuit for 10 Frequency Bands
Audio Power Amplifier Converter From Stereo to Mono
Hi-Fi Phono Preamplifier with RIAA Specification
Two Way Active Crossover with Linear Phase Response
35 Watts Vacuum Tube Power Amplifier by E80CC and EL34
TDA2004 Based Headphone Amplifier
Active Loudspeaker with 3-Way Output
Middle Frequency Equalizer with Parametric Feature
Soft Start for Loudspeaker with DC Protection
170W Audio Power Amplifier Circuit by NE5534
Peak Indicator for Audio Signal
TDA1516Q Driven 2x18W Power Amplifier
Class A-Based Headphone Amplifier
Modular Audio Mixer with Multiple Input Channels
Elimination of Common Signal from Stereo Audio
8R/6.25W Loudspeaker Driven by Power Amplifier
Auto Fade Implementation on Audio Signals
TDA7294-Based Power Amplifier for Audio Circuits
RIAA Standard Hi-Fi Phono Preamplifier
Integrated Circuit Based High End Audio Line Preamplifier
Line Preamplifier Circuit with Tube Acquisition
Electronic Crossover with 3-Way Output
Protection Circuit for Power Amplifier Output and Loudspeaker
Digital Volume Controlled Audio Preamplifier
Volume Unit Measurement with LM3915 and LM3916
Audio Signal Peak Indicator
Decoder Circuit for Small Surround Sound
Two-way Loudspeaker with High and Low Frequency
100 Watts VMOSFET Power Amplifier
Notch Filter Made With High and Low Pass Filter
Op-Amp Based Metronome Circuit
Electronic Sound of Chirping Canary
Intercom System with Telephone-Based Door Entry
Equalizer Circuit Operating on Three Bands
Amplifier With 15 Watts Output by 2N3055 and MJ2955
Preamplifier Powered Dynamic Microphone
Amplifier With Quadraphonic Pattern by LM1877
DC Sound Level Meter
LM324 Based LED VU-Meter
Tone Control And Soft Switch Operated Amplifier
Class A Amplifier Providing 24 Watts of Power
Audio Circuit With Voice-Over Capability
Audio Level Meter For Maximum Rating
Audio Preamplifier / Line Driver
Simple Microphone Design For Computer
Multiple Input Mixer
Creating A Microphone From A Speaker
Sound Perimeter Detection Circuit
Electret Condenser Microphone Preamplifier by BC650C or BC549C
Baxandall Tone Control Circuit - Bass and Treble Control
TDA2030 8 Watt Audio Amplifier
2 Watt Class-AB Audio Amplifier by BD139 and BD140
GLCD Audio Spectrum Analyzer by Atmel ATmega8
Multi Channel Audio Mixer by 2N3819 JFET
10 Band Graphic Equalizer by TL074 JFET Op-Amp
Simple Headphone Amplifier by BC549C
Efficient Pocket Headphone Amplifier by OPA2227P
160W Class AB Push-Pull Tube Amplifier by 6550, 12AX7 and 12AU7
Simple 30W MOSFET Audio Power Amplifier by IRF530 and IRF9530
Headphone Amplifier with Optional Tilt Control
Soft-Action Mute Switch
20 Watt Stereo Audio Power Amplifier by LM1875
Mini Metronome by 555 Timer/Oscillator IC
3 Watt HI-FI Stereo Amplifier
TDA2052 60 Watt Amplifier with Mute and St-By Functions
Alarm
Dummy Alarm with Flashing LED
Portable Alarm for Personal Use
Alarm Circuit for Refrigerator Doors
Electronically Controlled Security Door Keyboard
Alarm Circuit for Water Level Display
Alarm Circuit for Snoring Prevention by 555 Timer
Alarm Circuit Built for Motorcycles
Alarm System for Entrance/Exit Gate
Buzzer Circuit with Unique Functionality
Burglar Alarm Control Keypad
Single-Zone Automatic Burglar Alarm System
Water Triggered Alarm System Using 555 Timer
Small Sized Loop Alarm
Burglar Alarm with Expandable Modules
Five Zone Alarm with LED Display
Six Zone Alarm With LED Display
Remote Audio Detection And Security Monitoring
Burglar Alarm Powered By Battery
Battery
Express Battery Tester without Power Supply by 555 Timer
Battery Circuit for Backup/Standby Operation
Car Charger for 12V Batteries
Charger Circuit for 6V or 12V Car Battery
12V Lead Acid Battery Discharge Indicator
Nickel-Cadmium (NiCd) Battery Charger
Li-On Battery Charger via USB
Economic Battery Sufficiency Tester by BC547
Converter
50W 12V to 220V DC-AC Converter
555 Timer as an Analog to Digital Converter
Control
Headphone Amplifier with IR Communication
Clap-Sensitive Relay with ON/OFF Feature
Thermostat Heating System
Touch Controlled Capacitive Sensor Circuit
Digital Selector with 8 Sources
Window Switch Sensor Based on Temperature
Electronic Selector Driven by Relays
Switch Control with Touch-Sensitive Input
Relay Switch Activated by Tone and Signal
Gain and Volume Adjustment for Balance Input
Light Sensitive and Differential Temperature Switch
Auto Timer Circuit with Extensive Limit by LM555
ON/OFF Featured Touch Switch by 555 Timer
Electronic Lamp Switch Including Time Delay Option
Electronic Touch Triggered On/Off Switch
Siemens S566B Electronic Touch Dimmer
Single Channel Universal Infared Switch by 555 Timer
DC Motor Control Made of Solid State Switches
Light Dependent Switch Using ORP12 Photocell
Infrared Modulation Identifier Via Remote Control
PIC Controlled Navigation Board by 1490 Digital Compass
Clap Controlled Electronic Switch by 555 Timer and 4013 D Flip-Flop
32 Channel IR Remote Controller by SL490
Voltage Controlled Switch by BC547
100 Seconds Duration On Switch with Touch Control by LM555
Automatic Lamp Control with Light Sensitive Switch
One Button On Off Switch with 4093 and IRFZ44
Metering
Digital Voltmeter with 3-Digit Output by PIC16F676
Car Battery Voltmeter with LED Indicator
Alarm Indicator for High Temperature Reading
Digital Voltmeter and Ammeter Using CA3161E and CA3162E
ELF AC Milligauss Meter
Monitoring and Detection of Temperature
DS1621 PC Thermometer Requires No External Supply
Frequency Meter for 10 Hz to 100 kHz Input by 74121
Miscellaneous
Two Rhythmic LED as Flashing Eyes for Halloween
Battery Powered Night Lamp by 555 Timer
Courtesy Light with Time Delay Switch Aspect
Sine Wave Generator with 1KHz Frequency
Sequencer Circuit Using Lamps or LEDs
Noise Detector for Isolated Room
Safety Light for Bicycle Rear Portion
Digital Counter with an Interval of Kilometers
Replicator Circuit of Cricket Chirping Sound
Breathe Out Operated Electronic Candle
Equipment Indicator Using Two LED
Battery Powered Timing Device for Joggers
Detector Circuit for Energy Leakage
Timer Circuit for Amplifiers
Dual Direction Digital Ping-Pong by 555 Timer
Electronically Designed Dice Game Circuit by LM555
Door Ringer Circuit with Melodic Tone
Telephone Line Engaged Indication
Frequency Divider Using T Flip Flop Configuration
Failure Switch Monitor for Car Lamps/Bulbs
Preamplifier Input From Moving Coil Head
Crystal Oscillator Frequency Converter
Buzzer-Employed Timer Circuit With Optional Optocoupler
20Hz to 200Hz Variable High-Pass Filter
Ringer Circuit Using Sam Clock Method
Command-Operated Acoustic Tone
Relay-Operated Switch for Over Voltage and Under Voltage
Monitor and Look Out Circuit for Infant/Baby
Programmable Frequency Divider Circuit
Two LED Flasher by 555 Timer
Electronically Designed Siren Circuit
Electronically Designed Fuse for Power Supply
Filter Circuit for Human Speech
Photo Detector Circuit
Digital Ping Pong Circuit
7 Standard Step Frequency from Frequency Generator
Video Signal Emphasizer and Amplifier Circuit
Ring Indicator of Telephone Line Circuit by LM555
Frequency Multiplier for Low Frequency with Noise Rejection
Electronic Dice Circuit
Telephone Spy Conversation Recording Circuit
Electronic Key Operated Security Door
PC Sound Card with Stereo Microphone Line Mixer
Digital Clock Based on Sam Gordon Theory
Digital Roulette Circuit with 7-Segment Display
Center Brake Lamp on Car Rears
Negative Ion Generator Circuit
Monitoring Circuit for Telephone Line Usage
CMOS 4069 Driven Frequency Doubler
MM5314N Driven Digital Clock Circuit
Parking Indicator for Automobile
Push Button Electronic Switch with ON-OFF Feature
Audio-Operated Room Monitor Circuit
VGA Monitor Splitter and Extender
Off-Hook Telephone Line Indicator
Electronically Designed Keypad
Electrically Operated Siren by 2N3702 and BC108B
Building a Passive Ethernet Hub
Fast Electronic Fuse
Magnetically Operated Gun by NE555 and 4017B
A Torch Made of LED
Electronic Insect Repellent Circuit
Identifying Static Electricity
Bicycle Dynamo Regulator and Source Controller
Audio Intercom by LM380 and BC109C
Telephone Record Control by 2N4360 FET, 2N2222 and 2N2102
Programmable Current Source by LM317
Drive Multiple LEDs by Using Only One NiMH Cell
Switch Debouncer with Only One Inverter
TTL Level - RS232 Level Converter by MAX232
Simple Telephone Security Device
Series Protection Against High Voltage Transients
Fade-In & Fade-Out Effects to the In-Car Lights
Solid State Solution for Driving 2x55W Automotive Bulbs
LDR & LED Pair Smoke Detector and Alarm by LM1801
Ultrasonic Burglar Alarm
500Hz Modulated Ultrasonic Transmitter
High Voltage Protector for Meters by CA3130
Wire Continuity Tester by LM709
Power Supply
1A Power Supply with 0 to 15 Volts Adjustable Output
Regulated Power Supply with Stability at 3A
100 Watts Power Supply for Amplifiers using V-MOSFET
L200-Based Voltage Regulators
Single Voltage Supply with Symmetrical Output
Adjustable Symmetrical Power Supply by LM317 and LM337
Variable Voltage Output from 12V Battery Source
LM338 and LM350 Dual Power Supply
LM338-Based Power Supply with 13.8V at 5A Rating
MC1466L Driven Power Supply with 30 Volts at 2 Amperes
Additional Current Limiter for Power Supply
Regulated DC Power Supply with 13.8V and 20A Rating
LM317 and L200 Power Supplies with Soft Start
LM723 Variable Power Supply with Over-Current Protection
Dual Polarity Regulated Power Supply
Low Voltage Power Supply Without Transformer
L200 Variable Power Supply
Using LM317 with Overvoltage Protection
Power Supply Unit With Overvoltage Protection
Car Voltage Regulator Circuit Using LM317
Fuse Condition Monitor with LED Indicator
Uninterruptible Power Supply (UPS): Basic Circuit Diagram
Increasing 78xx Voltage Regulator Current
LM7812 High Current Power Supply by TIP2955 Pass Transistors
L200 0.1A to 2A / 2.85V to 36V Adjustable Power Supply
Power Supply Output Voltage Regulator by a Gyrator Circuit
High Voltage Power Supply with 300V and 600V DC Output
Hall Sensor Amplifier by LT6011 Micropower Op-Amp
1.25V to 25V 1.5A LM317 Power Supply
±12V Symmetric Power Supply by LM7812 and LM7912 Regulators
Voltage Controlled Power Supply Tester by OPA277
LM317 Based 0 to 3V Adjustable Power Supply
2-7V / 6-8A Power Supply by 723 and 7812
General Purpose Power Supply by L146 or IC 723
1.2 - 12V / 1A Low Voltage LED Indicator Power Supply by LM317
1.3 - 32 V / 5A Power Supply w/ Short Circuit Protection by LM338
Electronic Fuse for DC Short Circuit Protection by BRX46
Symmetric Power Supply for Op-Amp Applications by 78xx and 79xx
Radio Frequency
RF Remote Control with 3 Channels by PIC12F509
40 MHz Wideband RF Amplifier
Regenerative Receiver with Dual Polarity
Transmitter Detector for FM Bug Surveillance
High Selective Regenerative Shortwave Receiver
Shortwave Radio Frequency Preamplifier
VHF Amplifier with 30 Watts Power
Antenna Tuning Unit via Medium Wave
TV Preamplifier via UHF Band
Wideband Field Strength Meter for Radio Frequency
Self-Powered Automatic Repeater
FM Transmitter Circuit Providing 500mW Output
RF Preamplifier Operating in Band 2 VHF Range
Television Transmitter Operating at VHF Band
Voice Transmitter via AM Medium Wave Band
VHF Center Frequency FM Transmitter
Voice Transmitter Via FM Band 2 VHF by Hartley Oscillator
Shortwave MK414-Designed Receiver
Portable AM Receiver Using ZN414 Integrated Circuit
Amplitude Modulation Receiver Circuit
Whip Antenna Operating At Medium Wave Frequency
Voice Transmitter via Frequency Modulation
88-108 MHz VHF FM Band Preamplifier by 2N3819 FETs
High Power FM Wireless Microphone
Test Equipment
Collector-Base-Emitter Pin Identifier of Transistors
In-Circuit Tester for SCR, Diodes, and Transistors
1Hz to 1MHz Frequency Meter with Digital Display
Mini Spectrum Analyzer for Audio/Sound by LM3915
High Impedance DC Voltmeter using MOS Op-Amp
Alternating Square Pulse Generator
Zener Diode Voltage Tester
Power Amplifier Measured by VU Meter
1 KHz Frequency Wien Bridge Oscillator
Op-Amp-Based Wien Bridge Oscillator
Electromagnetic Field Measurement Probe
Circuit Continuity Tester Using Op-Amps
CMOS-Based Logic Probe Circuit
Low Frequency Wien Bridge Oscillator
Voltage Rating Tester for Zener Diode
General Purpose Bench/Utility Amplifier
Signal Injector and Tracer Circuit
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