BS2-OEM ‘LITE’

The BASIC Stamp Microcontroller can reduce the development time of many applications and therefore is a popular platform for both beginners and experienced developers. However the cost of the BASIC Stamp Microcontroller can be cost prohibitive in volume applications. This article shows several circuits and configurations for the BASIC Stamp 2 microcontroller designed to reduce BOM cost in OEM applications. These reference designs can be applied to all BASIC Stamp Microcontroller models. Read More

Prototype Audio Controller Main Board

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Sometimes when you etch your own PCBs using resist ink you can have issues such as over or under etching the board. But I hadn’t expected that my failure to clean and seal the board properly after soldering would result in oxidation eating the board away over the course of a year until my most complex hand-etched board would fail, taking my favorite and most used / enjoyed project with it. Read More

Prototype Power Amplifier

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This is the working Prototype Power Amplifier I built around the LM3886T Power Amplifier IC. This unit was capable of approximately 85W RMS with a peak power output over 100W! This was the first amplifier I built that was over 50W as well as the first time I used this particular audio amplifier IC. This prototype would lead to several more refined versions that eventually became the amplifier I used for my DJ business. Read More

Prototype Audio Controller Power Supply

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For my next project I broke things up into stages. The first step was to build the power supply for the audio controller section of my next amplifier. This is a 3-way power supply for that audio controller. The various circuits within the controller required 5VDC, 12VDC and -12VDC. This supply was designed to handle all of those needs. It used 2 transformers and three linear voltage regulators with heat sinks. Read More

Prototype Audio Level Meters

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These were my own design in audio level meters. This prototype was built to test in my next prototype audio controller. This design uses the LM3916N Dot/Bar display driver chip, and measures line-level audio signals. I got the 10-segment LED bar graph displays from Radio Shack. These work GREAT on line-level audio signals and are very fluid and responsive, allowing both dot and bar modes. Read More

Prototype Multimedia Amplifier

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As computer audio devices got better I felt a need for a better amplifier for my PC with more inputs so I could still have my SNES and Genesis connected. I also wanted to be able to see the level of the audio signal. This prototype had electronic input selection via four push-button switches on the front wired through logic into a special IC, the National Semiconductor LM1037N stereo audio switcher. The output of this amplifier used the LM2879 Dual 8-Watt amplifier IC, also by National Semiconductor. Read More

Production SNES / PC Amplifier

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This was an 8-Watt/channel version of the prototype. It used two LM383 Amplifiers. This final version also had an input selector for switching between your SNES and/or Sega Genesis, plus a better case with venting. This unit is still in use today by some old friends, although a couple say the volume control is a little crackly when adjusting it. I sold many of these to hardcore console and PC gamers back in the day. Read More

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