Circuit handbook
Oscillators - part 1
Oscillators - part 2
Oscillators - part 3
Oscillators - part 4
Amplifiers
Measurement
USSR analogs of 4000 series CMOS Logic ICs
Power supply
Radio and communication circuits - part 1
Radio and communication circuits - part 2
Miscellaneous circuits - part 1
Miscellaneous circuits - part 2
How to calculate coil inductance
Coil Inductance Calculator - download (26KB)
[Screenshot]
Computer
How to find out if your CPU is 32-bit or 64-bit
How to install windows 10 on a computer - a step by step guide
How to convert MIDI to MP3
How to install Windows 10 from Windows XP without DVD or USB stick
How to resize an image
How to block a program with Windows 10 firewall
Multi-DNS lookup Tool
Keyboard shortcuts in Windows 10
DPL Desktop program Launcher for Windows
How to use Wireless USB Adapter TL-WN823N as a Hotspot in Windows 10
How to open .stl file and the program OpenSCAD
How to create encrypted virtual hard disk in Windows 10
Using Wireless USB TL-WN823N V2 Adapter as an Access Point in Windows 10
Creating Windows 10 bootable USB drive on Linux
How to use Rufus to create bootable USB on Windows 10
Miscellaneous Circuits
Equipment for Soil Resistivity Measurements
LC astable multivibrator
RL Relaxation oscillator
Tuned radio frequency receiver
Astable Multivibrator with a wide range of pulse-width variation
Hidden wire detector
Non-Contact AC Mains Voltage Detector
Smoke detector circuit
Capacitance meter based on logic gates
Digital sine wave generator
Simple Analog to Digital Converter
Digital Signal Generators
Simple square wave generator
Sine wave signal generator
Radiation Indicator
FM Crystal Radio Receivers
The modernization of a crystal radio
AM synchronous detector
Linear AC voltmeter
VOLTMETER WITH IMPROVED LINEARITY
HAM RADIO SW RECEIVER
Medium wave receiver with a synchronous detector
Universal detector
VHF radio receiver
Simple VHF FM radio
FM receivers with PLL
UNIVERSAL LC OSCILLATOR
Dynamic AM Detector
How to find hidden wires?
Loudspeaking "crystal" radio receivers
Photoresistor-Based Oscillator
High frequency oscillator based on digital gates
A simple tuned radio frequency receiver
Simple voltage to frequency converter
Cheap voltage doubler
A new type of RC oscillator
Loudspeaking radio receiver with a bridge amplifier powered by "free energy"
Detectors for PLL receivers
Digital Noise Generator
How to improve the selectivity of the FM radio receiver
The oscillator with electronic tuning of frequency
Digital Sine Wave Oscillator
Microammeter serves as a tuning dial
Radio receiver "GEOLOG"
Simple Three Transistor Radio Receiver for Medium Wave Band
Digital frequency multiplier
LTSpice: how to use the Current Controlled Switch
Roulette wheel with 20 LED's and with 36 LED's
Sensitive envelope detector circuit diagram
A regenerative shortwave receiver with automatic regeneration control
The notch filter circuit
Bipolar stepper motor driver circuit
Single balanced mixer circuit
How to create stereo from mono signal
Low distortion RC oscillator
Voltage Controlled Frequency Divider
Frequency comparator circuit based on digital IC's
Multivibrator with wide frequency range
Digital noise generator circuit
FM crystal radio receivers: optimization of a radio receiver powered by the energy of radio waves
Online Resistor Color Code Calculator
Precision movement sensor
FM radio with PLL
Voltage to Frequency Converter Circuit
FM Radio with one transistor
Super Regenerator
Regenerative Shortwave receiver - The Last of the Mahicans
Superheterodyne receiver with one transistor
Three transistor radio with high sensitivity
How to measure the capacity of battery: a simple and accurate way
How to make alkaline water
Digital sine wave generator with CD4018
LTspice Tutorial - how to use this program
Frequency divider with variable division ratio
Circuit diagram of metal detector UMIV-1
A homemade simplest variable capacitor
Analogue capacitance meter
Frequency meter with 74121 monostable multivibrator
Balanced modulator with varicap
How to determine permeability of unknown cores - Online Calculator
Inductance and capacitance meter adapter for DVM
Capacitance meter circuit with 7400 IC
Simple LC meter
Simple ESR meter circuit
Voltage controlled oscillator circuit
A simple Envelope detector
RF mixer with automatic biasing for DCR
FM detector circuit
Crystal oscillator circuit with TTL IS
Direct-conversion receiver
RF Mixer for direct-conversion receivers
Anti-parallel diode mixer for direct-conversion receiver
FM detector with PLL for a direct-conversion receiver
Two multivibrator circuits with TTL ICs
Capacitance and inductance meter with digital ICs
A simple regenerative shortwave receiver
The Relaxation Oscillator circuit with CMOS IC CD4066
Voltage controlled oscillator with a CMOS Schmitt trigger
Voltage controlled oscillator with CMOS
How to revive dead Nickel-Cadmium batteries
NiMH and Nicd battery charger-regenerator circuit
Voltage converter circuit with blocking oscillator
Two Transistor Radio Receivers
Radio receiver with loop antenna
"Eternally speaking" radio receiver
How to powering radio receivers with "Free Energy"
How to calculate LC notch filter
A simple electric field indicator
Sensitive envelope detector detector with transistor
Direct Conversion Receiver for 40 and 80 meter bands
SSB Demodulator Circuit
Two transistor square law potentiometer
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