I have this circuit which I would like to use as a signal generator. I could use an IC, but then I would not have this much fun building it. Also, since I will be using this in some solar applications wide input range is essential, all the way up to the limit of the discretes. Finally, when it blows up I don't have to replace an expensive IC, just swap some resistors or transistors.
I have some issues with it, and if you are kind enough you could tell me how to improve it.
- At low load-resistance the wave-form is rounding a little too much. I do not believe this is big of an issue though.
- The 5.1 Volts peak is drifting somewhat between 7.6 minimum and the 28 maximum Vin. Not really an issue.
- At high load-resistance the output floats above 1 Volt. I need this to be as close to 0 as possible at all times - but at least under 200 mV. This I would like to fix.
- I cannot figure out what is the best way to modify the duty cycle. It would be nice to be able change by 10% increments.
- Please let me know If you think it would be safe to farther reduce current draw. I never actually built this circuit yet, but I read 4148 diodes need at least 1mA to produce the 600mV or so drop.
Anyhow, thank you for reading.
I have some issues with it, and if you are kind enough you could tell me how to improve it.
- At low load-resistance the wave-form is rounding a little too much. I do not believe this is big of an issue though.
- The 5.1 Volts peak is drifting somewhat between 7.6 minimum and the 28 maximum Vin. Not really an issue.
- At high load-resistance the output floats above 1 Volt. I need this to be as close to 0 as possible at all times - but at least under 200 mV. This I would like to fix.
- I cannot figure out what is the best way to modify the duty cycle. It would be nice to be able change by 10% increments.
- Please let me know If you think it would be safe to farther reduce current draw. I never actually built this circuit yet, but I read 4148 diodes need at least 1mA to produce the 600mV or so drop.
Anyhow, thank you for reading.
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