Harvey, Well, I still don't have a clear idea of your circuit, but here's my best guess.
The schematic is at http://www3.sympatico.ca/add.automation/misc/2eb56731.gif This shows the variac driving two LRC networks. To simplify things, I converted the Q to the equivalent parallel resistance. The leading network (+90) has the cap connected to the variac, and the lagging network (-90) connects the inductor to the variac. The variac output is labeled V0. The cell is shown as a 1 Meg resistor between the two outputs. The frequency response is shown in http://www3.sympatico.ca/add.automation/misc/2eb5685b.gif This measures the response of the circuit between 10Hz and 110Hz. It is a typical underdamped response. The top graph is the amplitude in db, and the bottom two traces are the leading (+90) and lagging (-90) outputs from the LRC sections. Note the constant 180 degree phase difference between the two outputs regardless of frequency. Also note at resonance, the two signals have a +/- 90 degree phase relation to the driving signal. This helps to understand the next graph http://www3.sympatico.ca/add.automation/misc/2eb568d4.gif This shows the transient response when power is first applied. The two output signals increase in amplitude at a rate determined by the Q of the networks. The black trace is the variac output. The red trace is the leading network (+90) and the blue trace is the lagging network (-90). These signals are 180 degrees out of phase with respect to each other, which develops the voltage across the cell. The final graph shows the current through the cell as the resistance is stepped from 50k to 2 Meg in 200k steps. The top blue trace is 50k, and the steps go down. http://www3.sympatico.ca/add.automation/misc/2eb56a4d.gif This shows the network is not a constant current source, and looks like a simple resistor connected to the variac. The value is determined by the Q of the circuit. This circuit is used in many applications that need a constant 180 degree phase shift between two signals, or a +/- 90 degree phase with respect to the carrier. An example of the latter would be quadrature modulation and demodulation. The same basic circuit is used in crossover networks for speakers. If your circuit is different, please let me know. Best Regards, Mike Monett -- The silver-list is a moderated forum for discussion of colloidal silver. Instructions for unsubscribing may be found at: http://silverlist.org To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
