7 Segment LED Counter

Analog opto-isolator

Analog pulse counter

Basic electronic circuits

Circuits collection

CW practice/Tx monitor (morse code)

Digital Call Sign Annunciator

Digital compass

Digital circuits collection

Doorphone

Doorbell beeper (PDF)

Doorbell for the Deaf

Electronic fish lure

Flash slave trigger

Flip Flop circuits

Fogger smoke machine

G Strain energy absorber

Gold wafer (smartcard) programmer

High Quality Intercom

Insect Repellant

Intercom schematic

LED Counter

Lightning Activated Camera Shutter Trigger

Low battery voltage flasher (PDF)

Nitrogen spark generator (PDF)

Pulse width modulators (PWM)

Quick designs collection

RDS Encoder

Simple event counter

Sound sensor with phase detector (direction finding)

Time to dust indicator (PDF)

Ultrasonic dog whistle

Ultrasonic generator

Ultrasonic sound receiver

Ultrasonic switch

Using white LED

UV light box

Very basic circuits

Voltage Comparator Information And Circuits

MAX924 bar-graph level gauge

Broadband 5MHz optical fiber receiver (PDF)

Broadband 2MHz optical fiber receiver (PDF)

Experimental data transmitter for fiber optics

Experimental fiber optic data receiver

High-speed light receiver (PDF)

Low-power optical interrupter (PDF)

Modulated light receiver (PDF)
 

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