A radiation detector with a solid-state PIN-diode sensor

I saw a cool app-note from Maxim that described a gamma-photon detector which used a regular PIN-diode as a sensor. The actual circuit looked simple enough so I decided build it, you can never have too many measurement instruments right?

A radiation detector with a solid-state PIN-diode sensor

The detector in itself is pretty simple, just some op-amps and a comparator. I decided to build it with all the bells and whistles so I included a digital potentiometer so you can adjust the reference voltage to the comparator via an SPI-bus. I also used a 5V reference shunt as the reference for the op-amps and the comparator to keep the circuits behaviour more consistent. I didn’t have any adjustable capacitors with an SPI bus so I decided against using one (instead of C4, changing the capacitance changes the gain).

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A Tiny Digital Humidity Sensor

The sensing mechanism uses changes in capacitance to measure relative humidity in the range from 0 to 100 %. Humidity readings are output as a digital value with a 14-bit resolution and a quoted accuracy of ±1.5 % RH at 25 ºC, 50 % RH. An internal temperature measurement feature outputs temperature information which is also used internally to compensate for the temperature coefficient of the humidity sensing element and improve linearity. The HSHCAL sensor operates from 1.71 to 1.89 V and draws 15 µA operating at 1.8 V and 1 Hz.

A Tiny Digital Humidity Sensor

The company anticipate that the device will principally find a home in mobile devices such as Smartphones, wearable electronics and also in air-conditioning, air purification and refrigeration applications. The device is now in full production.

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Basic principles of MEMS microphones

The application of MEMS (Micro Electro-Mechanical Systems) technology to microphones has led to the development of small microphones with very high performance. MEMS microphones offer high SNR, low power consumption, good sensitivity, and are available in very small packages that are fully compatible with surface mount assembly processes. MEMS microphones exhibit almost no change in performance after reflow soldering and have excellent temperature characteristics.

Basic principles of MEMS microphones

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DIY Solder Paste Dispenser

This DIY Solder Paste dispenser is an easy project to build, so I thought I would share the details a bit with everyone! When possible I like to build my own tools, it makes sense especially when you have most of the parts on hand. There are a lot of tools that are just yak shaving experience, but fortunately this isn’t one of them!

DIY Solder Paste Dispenser

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Saelig Introduces RevEng Reverse-Engineering Tool For Recreating Schematics

Hardware/software combo can create professional schematics from undocumented PCBs

Fairport, NY. The RevEng System is a remarkable reverse-engineering hardware tool for creating professional quality circuit schematic diagrams from a sample PCB that lacks documentation. The RevEng System consists of a PC-controlled continuity-detecting hardware system, RevWin control software, and EdWin, a fully featured CAD package. RevEng ʽlearnsʼ the connectivity of the sample circuit, producing a netlist of the components and connections for importing into EdWin software, resulting in professional quality circuit diagrams.RevEngʼs learning process is achieved through clips, connectors, and probes that are attached to clusters of components. RevWin guides the operator to place and walk the clips around the device under test. RevWin generates the most efficient sequence of clip combinations and movements to learn all possible connections, but the operator can override the automatic placement of the clips if necessary.

Saelig Introduces RevEng Reverse-Engineering Tool For Recreating Schematics

To minimize operator errors, the system applies an orientation check and pin check to confirm clip contact and position. RevEng learns without the need for applying power to the board and limits the applied voltage and current so that semiconductor gates are not affected, which also makes it safe to use on low power technologies.

The EdWin professional drawing capability includes features such as: importing netlist place components, autorouting signals, multi-page schematics, bus structure support, an extensive library of over 12,000 devices, ʽrubber bandʼ and ʽrats nestʼ functions, block move and rotate, etc. Optional facilities include Bill of Materials, PCB Layout, mix-mode simulation, Arizona Autorouter, thermal analyzer, EDSpice, EMC + Signal Integrity. Edwinʼs special features enable same-day drawings of unknown, complex boards.

RevWin is the software that controls the system hardware and provides links with the CAD software. Its key features include: icon-driven operation, context-sensitive help, unlimited number of clips and connectors, partial circuit learn and draw, repeat learn and verify, optimized clip movement, digital or analog circuits, guided probe for non-standard components, suspend/restart/terminated at any stage, etc.

The RevEng System is available as an entry-level system with 256 measurement channels for low budgets or small to medium circuits. For larger, more complex circuit needs, a high pin-count system equipped with up to 2048 measurement channels is also available.

Made by ABI Electronics Ltd., a leading European embedded test equipment manufacturer, the RevEng System is available now from Saelig Company, Inc. Fairport, NY. For detailed specifications, free technical assistance, or additional information, please contact Saelig 1-888-7SAELIG, via email: info@saelig.com,

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PCBGRIP: Electronics Assembly System

PCBGRIP is an electronics assembly system designed to make it easier to assemble electronics. Completely customizable, with open source flexibility, it holds printed circuit boards (PCBs), components, and stencils securely, improving both the quality and speed of assembly. It solves the challenges of hand electronics assembly and testing faced by hobbyists, makers, and assemblers.

PCBGRIP: Electronics Assembly System

Unlike other products that just hold PCBs, PCBGRIP holds PCBs and everything else. The open source aluminum extrusion and standard 3mm hardware allow you to build and share whatever you need to help you with your electronics project.

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Manual Pick and Place V2

After finishing the automatic pick and place project we soon found that we needed to be able to place components manually when working on prototype and very short production runs of pcb boards.

Manual Pick and Place V2

As the space in the loft workshop is very limited we decided to modify the old manual pick and place machine and make a new compact version which can be stored under the bench and put on the top when needed. For the frame we used 40mm x 20mm aluminium extrusion and made a frame which is 40cm deep x 45cm wide.

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