Light Pollution Meter
My circuit adds a transistor, to add feedback, and two resistors, to tailor the range of the control, with the result that a single-turn potentiometer gives a c...
Light Pollution Meter
My circuit adds a transistor, to add feedback, and two resistors, to tailor the range of the control, with the result that a single-turn potentiometer gives a c...
Ultra-simple Voltage Probe
This circuit is not a novelty, but it proved so useful, simple and cheap that it is worth building. When the positive (Red) probe is connected to a DC positive ...
Ultra-simple Voltage Probe
This circuit is not a novelty, but it proved so useful, simple and cheap that it is worth building. When the positive (Red) probe is connected to a DC positive ...
Time Domain Reflectometer (TDR)
This circuit is from Tomi Engdahl's page. It describes a nifty little TDR that, when combined with a regular oscilloscope, can be used to find discontinuities ...
Time Domain Reflectometer (TDR)
This circuit is from Tomi Engdahl's page. It describes a nifty little TDR that, when combined with a regular oscilloscope, can be used to find discontinuities ...
Revolution Meter
This is a simple rev-counter which can measure up to 100,000 rpm with method of strobe synchronization. Its usage is easy. Put a marker on the shaft before meas...
Revolution Meter
This is a simple rev-counter which can measure up to 100,000 rpm with method of strobe synchronization. Its usage is easy. Put a marker on the shaft before meas...
Making Differential Probes
Using a modern multimeter to measure current can sometimes be difficult. Many of these meters will only measure up to one amp. However, may 112-volt DC powered ...
Making Differential Probes
Using a modern multimeter to measure current can sometimes be difficult. Many of these meters will only measure up to one amp. However, may 112-volt DC powered ...
40MHz Frequency Counter Module
The standard circuit will display directly in Hz (1MHz max), and there is a seperate on board divider that will allow you to display directly in KHz (approx 40M...
40MHz Frequency Counter Module
The standard circuit will display directly in Hz (1MHz max), and there is a seperate on board divider that will allow you to display directly in KHz (approx 40M...
Digital Volt and Ampere meter
The circuit does not present particular difficulties for somebody that has a small experience. The two circuits are the himself, with a small difference only in...
Digital Volt and Ampere meter
The circuit does not present particular difficulties for somebody that has a small experience. The two circuits are the himself, with a small difference only in...
Universal frequency meter
This is 7-digit frequency meter measuring frequency from 10 Hz up to 1300 MHz. It is based on ideas of PIC16F84 based frequency meter. The measuring range is di...
Universal frequency meter
This is 7-digit frequency meter measuring frequency from 10 Hz up to 1300 MHz. It is based on ideas of PIC16F84 based frequency meter. The measuring range is di...
1 GHz Counter
This simple counter is useful for frequency measurements of various wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF ban...
1 GHz Counter
This simple counter is useful for frequency measurements of various wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF ban...
Capacitance Meter III
This simple add-on capacitance meter has been specially designed to help you identify capacitors from 1p to 10u. There has always been a problem identifying cap...
Capacitance Meter III
This simple add-on capacitance meter has been specially designed to help you identify capacitors from 1p to 10u. There has always been a problem identifying cap...