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Thyristor Tester – Circuit Schematic
Thyristor Tester
The circuit in the diagram is a very handy tool for rapidly checking all kinds of thyristor (SCR, triac, ). In case of a triac, all four quadrants are te.....
Spike Detector For Oscilloscopes – Circuit Schematic
Spike Detector For Oscilloscopes
Dynamic flip-flops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to.....
Speed Pulse Generator For PC Fans – Circuit Schematic
Speed Pulse Generator For PC Fans
This circuit generates speed pulses from the speed-dependent voltage spikes generated by commonly used types of PC power supply fans, which are superimpos.....
Relative Field Strength Meter For A DMM – Circuit Schematic
Relative Field Strength Meter For A DMM
Many passive field strength meters have appeared in the past, typically using a 50mA analog meter movement if reasonable sensitivity was to be obtained. T.....
PC Heat Monitor – Circuit Schematic
PC Heat Monitor
The PC processor generates very high temperature during its operation which is dissipated by the large heat sink placed above the processor. If the heat s.....
Multiple Continuity Tester – Circuit Schematic
Multiple Continuity Tester
The continuity tester is a handy adjunct to an ohmmeter. The unit or component whose continuity is to be checked is connected between terminals E1 and E2.....
Meter Adaptor With Symmetrical Input – Circuit Schematic
Meter Adaptor With Symmetrical Input
In contrast to an ordinary voltmeter, the input of an oscilloscope generally has one side (GND) connected to ground via the mains lead. In certain situati.....
Maximum Minimum Voltage Indicator – Circuit Schematic
Maximum Minimum Voltage Indicator
This circuit indicates which of three voltages in the range from about about -4V to about +4V at A, B and C is the highest by lighting one of three in.....
Mains Frequency Monitor – Circuit Schematic
Mains Frequency Monitor
Here is a simple frequency counter designed to monitor the 240VAC mains supply. It as a frequency range of 0-999Hz, so it could also be used with 400Hz eq.....
Liquid-Crystal Display (LCD) Tester – Circuit Schematic
Liquid-Crystal Display (LCD) Tester
A segment may be tested by applying an alternating voltage of a few volts across it. Note that the application of a direct voltage will damage the display irrev...
Linear RF Power Meter – Circuit Schematic
Linear RF Power Meter
The National Semiconductor LMV225 is a linear RF power meter IC in an SMD package. It can be used over the frequency range of 450 MHz to 2000 MHz and requ.....
Light Gate With Counter Using 555 And 4033 – Circuit Schematic
Light Gate With Counter Using 555 And 4033
The circuit described here counts the number of times that an infrared beam is interrupted. It could be used to count the number of people entering a room, for ...
Geiger Counter Uses Cockroft-Walton Multiplier – Circuit Schematic
Geiger Counter Uses Cockroft-Walton Multiplier
The recent tsunami in Japan and the on-going calamity with the Fukushima nuclear power plant has apparently greatly increased sales of radiation meters, n.....
Four-Channel Oscilloscope Adaptor – Circuit Schematic
Four-Channel Oscilloscope Adaptor
This circuit enables you to display four signals simultaneously using only one channel of your oscilloscope. Essentially, it switches each of the inputs t.....
Fast Voltage-Driven Current Source – Circuit Schematic
Fast Voltage-Driven Current Source
The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measurements. Differential.....
Electronic Torricelli Barometer – Circuit Schematic
Electronic Torricelli Barometer
Although it does not have the same charm as real mercury barometers with long glass tubes on pieces of carved and polished wood, the Torricelli barometer.....
Digital Step-Km Counter Circuit Schematic – Circuit Schematic
Digital Step-Km Counter Circuit Schematic
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the follow...
Digital Bike Tachometer – Circuit Schematic
Digital Bike Tachometer
This digital DIY tachometer for bikes uses two reed switches to get the speed information of the bicycle. The reed switches are installed near the rim of.....
Continuity TesterCircuit – Circuit Schematic
Continuity TesterCircuit
Having good contacts is important not only in your daily life, but also in electronics. In contrast to social contacts, the reliability of electrical co.....
Components Voltage Tester Circuit Schematic – Circuit Schematic
Components Voltage Tester Circuit Schematic
This simple circuit tests speakers, microphones, transformers and voltage. It`s basically a very low frequency oscillator that produces extremely short fruity` ...