Sitemap - Hobby electronics

Ham radio:
Ham radio basics and the Morse code.

Resistors - color code chart, calculator and standard resistor examples:

How to read resistor color codes
Resistor color code calculator
SMD resistor calculator

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 E24 resistors with color codes, shorthand notation and tolerance range.

Simple hobby projects:

Metal detector theory and a simple BFO metal detector schematic
Wireless microphone schematic diagram
Fluid level control schematics with LM1830 fluid level detector IC
Simple rain detector circuits

Audio amplifier circuits:

Class-D audio amplifiers with: LM4652 (170W) and TDA7480 (10W)
More audio power amplifiers with: TDA2005, TDA1013B, LM386, TDA2040 and TDA2003.

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 ±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.

Schematic diagrams:

Metal detector schematics:

Heathkit Cointrack Gd-1190 Metal Locator
Heathkit Groundtrack GR-1290 VLF metal detector
White's Classic I metal detector schematic

Guitar pedal schematics:

Boss CE-2 Chorus
Boss BF-2 Flanger
Boss OC-2 Octave
Boss GE-7 Equalizer

Boss OD-1 OverDrive
Boss OD-2 Turbo OverDrive
Boss SD-1 Super OverDrive
Boss MT-2 Metal Zone

Boss DM-2 Analog Delay
Boss DD-2 Digital Delay

Miscellaneous topics:

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

DMMs:
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.

Links to good sites on hobby electronics and component manufacturers

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