Noise Source PSU - Revision history

G8GKQ at 17:00, 10 December 2021

2021-12-10T17:00:29Z

2021-12-05T20:56:20Z

2021-12-05T20:55:16Z

2021-12-03T20:48:53Z

Error on the First Batch of PCBs

2021-12-03T20:47:11Z

Error on the First Batch of PCBs

2021-12-03T20:40:32Z

Error on the First Batch of PCBs

2021-12-03T20:36:34Z

2021-12-03T20:16:01Z

2021-12-03T20:13:20Z

2021-12-03T18:15:54Z

← Older revision		Revision as of 17:00, 10 December 2021
Line 1:		Line 1:
−	This simple unit is designed to switch a 28v (or 12v) supply for a Noise Source and be controlled by the Portsdown NF Meter. The input switching signal is 0v for the "off" state and 3.3v for the "on" state.	+	This simple unit is designed to switch a 28v (or 12v) power supply for a Noise Source and be controlled by the Portsdown NF Meter. The input switching signal is 0v for the "off" state and 3.3v for the "on" state.

	[[File:Noise Head PSU.jpg\|437px]]		[[File:Noise Head PSU.jpg\|437px]]

@@ Line 34: / Line 34: @@
 The PCB is designed to fit in a Die-cast box with a BNC for the output socket.  This is the standard connector for commercial nNoise Sources.  The input supply and switching is fed through a grommet into the box.
-Note that none of the regulator or transistor tabs need should be connected to the Die Cast box.  If there is risk of them touching the box, then insulation tape or an insulating washer should be used to prevent this happening.
+Note that none of the regulator or transistor tabs should be connected to the Die Cast box.  If there is risk of them touching the box, then insulation tape or an insulating washer should be used to prevent this happening.
 ===Measured Performance===

@@ Line 34: / Line 34: @@
 The PCB is designed to fit in a Die-cast box with a BNC for the output socket.  This is the standard connector for commercial nNoise Sources.  The input supply and switching is fed through a grommet into the box.
-Note that none of the regulator or transistor tabs need should be connected to the Die Cast box.  If there is risk of them touching the box, then insulation tape should be used to prevent this happening.
+Note that none of the regulator or transistor tabs need should be connected to the Die Cast box.  If there is risk of them touching the box, then insulation tape or an insulating washer should be used to prevent this happening.
 ===Measured Performance===

← Older revision		Revision as of 20:48, 3 December 2021
Line 58:		Line 58:
	After Modification:		After Modification:

−	[[File:Repair 1.jpg\|489px]] [[File:Repair 2.jpg\|555px]]	+	[[File:Repair 1.jpg\|489px]]
		+
		+	Cut track 1 and wire link 3
		+
		+	[[File:Repair 2.jpg\|555px]]
		+
		+	Cut track 2 and wire link 5

@@ Line 48: / Line 48: @@
 The unit functions if assembled with the error, but the current limit will not work correctly.
 To correct the error, the PCB should be modified as shown below, or pins 1 and 2 on U2 should be swapped.
 [[File:Incorrect wiring.png|263px]] [[File:Correct wiring.png|268px]]

← Older revision		Revision as of 20:40, 3 December 2021
Line 48:		Line 48:
	The unit functions if assembled with the error, but the current limit will not work correctly.		The unit functions if assembled with the error, but the current limit will not work correctly.
	To correct the error, the PCB should be modified as shown below, or pins 1 and 2 on U2 should be swapped.		To correct the error, the PCB should be modified as shown below, or pins 1 and 2 on U2 should be swapped.
		+	[[File:Incorrect wiring.png\|263px]] [[File:Correct wiring.png\|268px]]

@@ Line 5: / Line 5: @@
 [[File:NF_Schematic_Extract.JPG|917px]]
-The simple schematic is here [[:Media:NoiseHeadPSU.pdf]]
+The full schematic is here [[:Media:NoiseHeadPSU.pdf]]
 The Bill of Materials is here. [[:File:NF Switch BOM.xlsx]]
 ===Error on the First Batch of PCBs===

← Older revision		Revision as of 20:16, 3 December 2021
Line 2:		Line 2:

	[[File:Noise Head PSU.jpg\|437px]]		[[File:Noise Head PSU.jpg\|437px]]
		+
		+	[[File:NF_Schematic_Extract.JPG\|917px]]

	The simple schematic is here [[:Media:NoiseHeadPSU.pdf]]		The simple schematic is here [[:Media:NoiseHeadPSU.pdf]]