I have been working on Jay’s Dual Dynamic Electronic Load. The circuit has been hacked to remove the original oscillator portion of the circuit and to add back an auxiliary input, for an independent function generator. This is, now, on the breadboard.
I do not have a LT1013 op amp, in stock, as is specified, by the schematic. I am using a LM741, just for testing the circuit concept. I have corrected the pin connections, to the correct pinout.
I have limited experience, with my test equipment. I would appreciate your help, in confirming that I have made the connections correctly.
The PSU is a BK Precision, 1735, Linear, 30v/3a. It has the common Negative, Earth and Positive banana jack connectors.
Negative and Earth are not tied, at this point.
The Frequency Generator is part of a Tenma Universal Test Center, 72-1005, 0 – 20MHz. It settings are 500KHz, at 1v.
The oscilloscope is a Tektronix 2215, Analog, 60MHz. It settings are x10 probe - 1V/D - 10mS/D. I am confident enough to have looked (directly/independently) at the FG signal, on the oscilloscope, and it appears correctly.
Things get a little sketchy, for me, working with earth ground and the negative voltage supply. The drawing shows how I have things connected. But, before powering everything on, together, I wanted to verify the setup.
Of particular interest is the probe ground connection. Should it go to earth ground, or the negative supply? My guess is that it goes to earth, because, when I had it attached this way, while testing only the FG signal, the negative component, of the sign wave, appeared below the zero volt base line. The op amp output is connected to the oscilloscope probe input.
Thoughts and suggestions, please and thank you.
