Friday, August 17, 2012
This video shows the troubleshooting and repair (?) of the Leader LG-1311 Function Generator that was shown in a previous video. The previous video showed how the problem with this function generator could have been mistaken for a trigger problem on the scope. The generator had a problem with a low level, high frequency oscillation that was riding on top of the function generator output. The video briefly shows the process I followed to narrow the problem down, identify the offending circuit, and the result of the "repair". I put "repair" in quotation marks because the "fix" involved changing the original design. So, it is still possible that there is another underlying problem that was alleviated by altering the design slightly.
http://www.youtube.com/watch?v=x3z2QSVtjSA&hl=en
Wednesday, May 30, 2012
My new XR2206 function generator. Based on an ELEKTOR circuit diagram from 1977. The XR-2206 is a monolithic function generator integrated circuit. Features: + Square, sine, triangle, sawtooth wave output or pulses. + Frequency range from 10 Hz to around 200 kHz. + Amplitudes from around 0.01 V to 4 V (or more) + Audio output is possible For demonstration a digital storage oscilloscope DSO 062 from JYE-Tech and a speaker were connected to the output. Frequency can be adjusted by a ten turn wirewound precision potentiometer + multiplicator (x1, x10, x100, x1000) + another x2 multplicator. Surprisingly most of the 1970s electrical components are still available. So it is ~ 99% the 1977 model. Only the original voltage regulator had to be replaced by a 7812 . It should be noted that nowadays simple sound cards are better and cheaper function generators. However, I like this old technique. ;-) Elektor kindly gave me the permission to post the links to the original articles from 1977 (German and English language): www.elektor.de/120068 and www.elektor.com/120068
http://www.youtube.com/watch?v=KPtsgFw5Fno&hl=en
