Resistors - color code chart, calculator and standard resistor examples:
Standard resistor examples:
E12: .1Ω-.82Ω, 1Ω-8.2Ω, 10Ω-82Ω, 100Ω-820Ω, 1k-8.2k, 10k-82k, 100k-820k and 1M-8.2M. E24 resistors - a table with all commonly used E24 resistors - with color codes, shorthand notation and tolerance range
E48 resistors - a long list of E48 resistors with color codes, shorthand notation and tolerance range.
Simple hobby projects:
Metal detector theory, simple VLF, PI and BFO schematics
Wireless microphone schematic diagram
Candle light simulator circuit with only 4 transistors
Fluid level control schematics with LM1830 fluid level detector IC
Simple rain detector circuits
Audio amplifier circuits:
Switching regulator schematics:
Step-down (buck) regulator with LM2576 (5V/3A fixed and 1.2-50V/3A variable output)
Step-up (boost) regulator schematic with LM2577 (5V to 12V/800mA)
Simple flyback regulator with LM2577 (5V to Â±15V/225mA)
Isolated flyback regulator with LM2577 (5V/150mA, 7.5V/100mA, and -7.5V/70mA).
Hobby electronic kits:
PWM DC motor speed control, Step-by-step motor driver kit, AC motor speed control, high power LED strobe, electronic dice kit, LED blinking eyes kit, stereo headphone amplifier, 20W Class-D amplifier, 7W audio amplifier kit.
How to test diodes, transistors, Zeners, LEDs and MosFets
Interfacing computer microphones to sound cards
Standard color codes on computer sound cards
LED series resistance calculator
DT830B, M890G, Innova 3320, MY-68 - schematic diagrams, technical specifications, operating instructions.
ICL7106 and ICL7107 - high performance, low power 3 1/2 digit A/D converters used in DMMs - pinout, technical specifications and example circuits.