Open Amplifier - Revision history

Marco-Guerini: /* Uncommitted Amplifiers in THAT */

2024-12-29T20:00:41Z

Uncommitted Amplifiers in THAT

← Older revision		Revision as of 20:00, 29 December 2024
Line 9:		Line 9:

	For Summers 1 to 4, the associated resistors to be pulled to ground are 10k (Version 1.3!) in value, and numbered R46, R49, R52 and R55. The Analog Switches associated are labelled IC29X, with X being a letter A to D, being part of the [[DG212B]]-type IC used throughout THAT.		For Summers 1 to 4, the associated resistors to be pulled to ground are 10k (Version 1.3!) in value, and numbered R46, R49, R52 and R55. The Analog Switches associated are labelled IC29X, with X being a letter A to D, being part of the [[DG212B]]-type IC used throughout THAT.

			With feedback removed, the amplifier will immediately overload, lightning the central Overload OL light. To correct this, proper feedback components must be connected between SJ and Out jacks.

			== Feedback in Open Amplifiers ==
			Proper feedback is achieved by patching a component in place of the original resistor.

Marco-Guerini: /* Uncommitted Amplifiers in THAT */

2024-12-29T19:50:24Z

Uncommitted Amplifiers in THAT

← Older revision		Revision as of 19:50, 29 December 2024
Line 6:		Line 6:
	In THAT, only a [[Summer]] can be converterd to an Open Amplifier. This is accomplished by ground the FB terminal to the ground post directly under it.		In THAT, only a [[Summer]] can be converterd to an Open Amplifier. This is accomplished by ground the FB terminal to the ground post directly under it.

	This pulls a resistor to ground, activating an [[Analog Switch]] which in turn opens the feedback path between the Summing Junction and the Output of the amplifier in question.		This pulls a resistor to ground, activating an [[Analog Switch]] which in turn opens the feedback path between the [[Summing Junction]] and the Output of the amplifier in question.

	For Summers 1 to 4, the associated resistors to be pulled to ground are 10k (Version 1.3!) in value, and numbered R46, R49, R52 and R55. The Analog Switches associated are labelled IC29X, with X being a letter A to D, being part of the [[DG212B]]-type IC used throughout THAT.		For Summers 1 to 4, the associated resistors to be pulled to ground are 10k (Version 1.3!) in value, and numbered R46, R49, R52 and R55. The Analog Switches associated are labelled IC29X, with X being a letter A to D, being part of the [[DG212B]]-type IC used throughout THAT.

Marco-Guerini: Created page on Open Amplifers (Need pictures and links to needed components)

2024-12-29T19:48:51Z

Created page on Open Amplifers (Need pictures and links to needed components)

New page

An '''Open''' or '''Uncommitted Amplifier''' is an operational amplifier that had its feedback resistor removed, leaving only the input resistor in-circuit.

This allows different feedback elements ([[XIR]] networks, a [[Capacitor]], [[Diode]] and so on) to be connected across the summing junction labeled SJ and the output of the amplifier. Doing this in turn modifies the transfer function of the amplifier, making it potentially more complex and more useful.

== Uncommitted Amplifiers in THAT ==
In THAT, only a [[Summer]] can be converterd to an Open Amplifier. This is accomplished by ground the FB terminal to the ground post directly under it.

This pulls a resistor to ground, activating an [[Analog Switch]] which in turn opens the feedback path between the Summing Junction and the Output of the amplifier in question.

For Summers 1 to 4, the associated resistors to be pulled to ground are 10k (Version 1.3!) in value, and numbered R46, R49, R52 and R55. The Analog Switches associated are labelled IC29X, with X being a letter A to D, being part of the [[DG212B]]-type IC used throughout THAT.