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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 E48 resistors with color codes, shorthand notation and tolerance range.

Surface mount resistor code examples: 3-digit, 4-digit and EIA-96.

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:

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
CE-2B Bass Chorus
Arion SCH-1 Chorus
Pearl CH-02 Chorus
Boss BF-2 Flanger
Pearl FG-01 Flanger
Boss OD-1 OverDrive
Boss OD-2 Turbo OverDrive
Boss SD-1 Super OverDrive
Boss MT-2 Metal Zone
Boss MT-2 Metal Zone
CS-2 Compression Sustainer
Boss DM-2 Analog Delay
Boss DD-2 Digital Delay
Boss TR-2 Tremolo
Boss GE-7 Equalizer
Boss GE-7B Bass Equalizer
Boss OC-2 Octave

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

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.

Where to buy resistors, capacitors and LEDs online.

Links to good sites on hobby electronics and component manufacturers