I have found plenty of triangle waveform generator circuits but they can't do any actual work.
The waveforms are cute to look on a scope but they float somewhere between + and ground. Not from ground to + and back.
I have a 12V DC 3 Amp load, the circuit is potted so I can't get inside it to modify the original circuit.
I need to sweep this load's power from all of the way on to all of the way off
and back again. Frequency adjusted from 10 Hz down to .1Hz with a pot.
Needing constant current is not an issue.
Adjusting the high voltage limit and low voltage limit of the sweep is necessary.
Attached, I hope, is the basic sweep circuit I have started with.
It's output hangs close to the 12V rail and is around 4 Volts peak to peak and I can't remove the positive voltage offset to get a signal I could drive a higher current bipolar transistor with to control the load without affecting the sweep shape.
Any help would be appreciated.
The waveforms are cute to look on a scope but they float somewhere between + and ground. Not from ground to + and back.
I have a 12V DC 3 Amp load, the circuit is potted so I can't get inside it to modify the original circuit.
I need to sweep this load's power from all of the way on to all of the way off
and back again. Frequency adjusted from 10 Hz down to .1Hz with a pot.
Needing constant current is not an issue.
Adjusting the high voltage limit and low voltage limit of the sweep is necessary.
Attached, I hope, is the basic sweep circuit I have started with.
It's output hangs close to the 12V rail and is around 4 Volts peak to peak and I can't remove the positive voltage offset to get a signal I could drive a higher current bipolar transistor with to control the load without affecting the sweep shape.
Any help would be appreciated.
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