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FG085 function generator
I finally had time today to assemble the FG085 function generator kit that I bought last September (it’s been a busy 9 months). I bought the kit from Sparkfun, on sale for $38 (it is now $50 from them...
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FG085 function generator bugs
I previously reported on assembling the FG085 function generator kit and measuring its output impedance. I noted that the output impedance was only 46.7Ω, instead of 50Ω, and in Testing nFET body diode...
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Measuring BitScope BS-10 input impedance
In Voltmeter impedance I presented a 2-voltmeter way of measuring AC voltmeter impedance, and in Measuring voltmeter input impedance I presented a way of measuring the AC voltmeter impedance with just...
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New dimmer software
Based on the success of the stroboscope software, I rewrote the dimmer software for my desk lamp (see LED lamp projects for more about the lamps). The new software provides smoother control of the...
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Bitscope function generator review
I’ve previously reviewed a couple of cheap function generators: the Elenco FG-500 and the JYEtech FG085 (also here and here). But I can’t remember whether I’ve reviewed the use of the function...
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Ultrasonic rangefinder pings
Earlier today I made a comment: One of these days (when I’m not working on my book or teaching classes) I’ll have to get out the ultrasonic rangefinders again and experiment with them to find out what...
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H-bridge Class-D works
The simplified class-D amplifier using a cMOS H-bridge works! Using an inverter chip (in this case a 74HC14N Schmitt trigger chip) to provide separate amplifiers for each nFET and pFET allows using the...
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H-bridge Class-D hum problem solved
I H-bridge Class-D works I mentioned I was getting a rather annoying amount of 60Hz hum, probably from the microphone preamplifier. I’ll have to play with it a bit tomorrow to see if I can avoid the...
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Digilent Analog Discovery 2 USB Oscilloscope
I have recently learned about a new USB oscilloscope, Digilent’s Analog Discovery 2, which seems to be a step up from the BitScope BS10 USB oscilloscope that I currently own. Digilent’s offering has...
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Dehumidifier
In Average annual power use, I mentioned I will be buying a dehumidifier for our house, to reduce the condensation on the walls. Current Energy Start rated dehumidifiers remove about 1.85 liters of...
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Improved spectral response for dehumidifier noise
In Dehumidifier, I provided spectral analysis of the sound from the 30-pint Whynter RPD-321EW Energy Star Portable Dehumidifier, using my BitScope USB oscilloscope to record the sound and averaging the...
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Pulse monitor using log amplifier
I am currently rewriting the optical pulse monitor lab for my Applied Electronics for Bioengineers book, because I’ve moved it earlier in the course, and because I need to remove the calculation of how...
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FET Miller plateau with Analog Discovery 2
I recently bought myself a birthday present: an Analog Discovery 2 USB oscilloscope. The device normally costs $279, but I qualify for the academic discount, which brought the price down to $179—a...
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