Logic Probes for Digital Testing

Digital Test and Measurement Starts with Logic Probe - Any point in a Digital Circuit can be High, Low, Float means TriState. The High Low in a 5V CMOS circuit is just 0V and 5V. In TTL and ECL it is much different

TTL Pulse Reading Logic Probe - This circuit can monitor TTL logic levels. TTL compatible CMOS logic families can also be monitored.

The Test Point could also be Pulsing or have analog values and waveforms, as in Mixed Signal Chips. Here are Logic Probe Circuits you can Build in your own Home Lab.



Simple Logic Probe - Here is a simple Logic Probe using a single chip. The circuits have been designed for the CD4001 CMOS quad NOR gate and CD4011 CMOS NAND gate

Andy Collinson - Logic Probe - This logic probe uses a single CMOS 4001 IC and can display high, low and pulsing outputs.

Homemade Metal Detector Kit

This idea is both for indoor and outdoor use, depends on how you could modify or enhance it. The important reason you ought to build this circuit is to learn building non-ic oscillators, this trains you on L, C, R and Transistor Switching. - delabs



With a handy metal detector you can check beforehand whether there are metal objects in a wall, ceiling or floor. An LED indicates if a metal object is in the vicinity and keeps your simple home projects, simple and safe.

Homemade Metal Detector Kit

Avoid disaster when drilling at home By Ben Godfrey

Ben Godfrey is an electrical engineering student at the University of California, Davis. Ben has written iPhone applications and is a Ham Radio operator.

See also  - Metal Detector Circuits Problem

The Micro Stop - RS232 microcontroller

"These pages are a useful collection of microcontroller RS-232 data acquisition circuits and code. Most of the code on these pages is written in C because it is the language that is definitely the fastest way to produce working applications."

The Micro Stop - RS232 microcontroller



RS232 controlled and RS232 powered DVM-001 voltmeter kit with PC voltage display. This circuit uses a PIC12F675 8-pin microcontroller with built-in analog to digital converter. The circuit also has an op amp and resistor divider network to achieve the 54vdc max input voltage.

Measureall Workbench Test Instrument

This was a Student Project, it is a very basic instruments that could do most of the tasks on a test bench.

The cabinet used, was available as a part of a Hi-Fi DIY System, The Range and Mode switches were Modular Stackable Interlocked MultiPole Switches. The rest of the Interface were wirewound pots, jacks, sockets and plugs. The front panel was Engraved Acrylic.

I wanted it to look well engineered, at least on the outside. It was a total analog instrument except for the digital indication of ICL7107. Thanks to 'Intersil Hot Ideas' Applications Book.

• Diode Thermometer
• Voltmeter Attenuator Rectifier
• Dual Power Supply
• Function Generator using ICL8038

The above belong to an instrument Measureall shown

Bakatronics - DIY Kits and Model Railroads

Bakatronics LLC designs and manufactures innovative electronic circuits for model railroads.  For the last decade Baka has been creating new ways to make your model railroads "come alive". 

Bakatronics - DIY Kits and Model Railroads

The Kits include the Lighthouse Flasher, Emergency Lights, Airport Beacon, Campfire and Super Welder Flash kits All are based on advance micro controller technology and will enhance any railroad.



FK945 Digital Temperature Controller kit

This circuit can be used to control when an appliance or device turns on and off by temperature. 3 Digit Read Out and easy to set buttons.