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USB to Serial Adapter RS-232
Posted on Wednesday, August 26, 2009   •   Category: USB Interface Adapters


The USB to Serial adapter (converter) lets you use a serial PDA, GPS, cell, etc. with a standard USB port. This adapter is the easiest way to add a serial port to your computer. Many PDAs, digital cameras, GPS units, barcode scanners, and other equipment require a serial connection, and many newer computers don't come equipped with serial ports anymore.


30W Digital Wattmeter for RF (0-500MHz)
Posted on Saturday, August 22, 2009   •   Category: FM Transmitters


This watt meter project is very similar to my last wattmeter project. The main reason I made a new project is becasue I needed a unit which could handle higher power than 1W. I found a 50 ohm dummy load which could take 50W of power. Of course I could use attenuates for my 1W meter, but I prefered to build a new unit. The new thing with this project is that it will only display the power in Watt on the LCD display.


R/C Battery Voltage Monitor
Posted on Saturday, August 22, 2009   •   Category: Battery Chargers


The Simple-Volt automatically detects the number of LiPo cells connected (assume charged pack) and continually monitors the battery voltage and compares it to the preset cutoff/warning voltage corresponding to the number of detected LiPo cells (9v for 3s, 12v for 4s and 15v for 5s... basically, 3 volts minimum per cell). When the battery voltage is greater than the cutoff voltage +1v, the Green LED will be on solid. If the battery voltage is > cutoff voltage+.5 but < cutoff voltage+1v, the Green LED will slowly flash. If the battery voltage is > cutoff but < cutoff+.5v, then the Red LED will begin flashing. If the battery voltage < cutoff voltage, both Green and Red LEDs will flash very fast while also emitting an intermittent beeping sound from the peizo alarm buzzer.


CLASS A MOSFET AMPLIFIER
Posted on Saturday, August 22, 2009   •   Category: Amplifiers


I was in my final 6 month work term with an electronics company as a trainee. Within this company there are a few audiophiles who are tube lovers and spend astronomical amounts of money on their audio equipment. My training supervisor had found Mark's Class A MOSFET Amplifier Project and suggested that I design a PCB and build this project as part of my training. I followed the Class A MOSFET Amplifier Schematic with the following exceptions. Instead of the 2SK1058, I used the 2SK2221 mosfet which I had on hand. I compared the datasheets of the 2SK1058 and the 2SK2221 and the differences between the two were very small. The other change was to use a 6800 uF capacitor on the output instead of a 4700 uF capacitor.


+/- 15V Power Supply
Posted on Saturday, August 22, 2009   •   Category: Power Supplies


The main balanced power supply is constructed with the usual suspects, 7815 (pos 15 volt regulator) and 7915 (neg 15 volt regulator). These are fed from rectified AC via a PCB mount 6VA power transformer. I have use four diodes in a bridge rectifier configuration rather than a dedicated bridge rectifier as people have had trouble finding P04 and W04 rectifiers and it allows you to get esoteric with low noise switching diodes. I used the simple and easy to get IN4004 but some at Tech Talk have suggested more exotic devices.


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