Changes in 03f2595: kicad

				BOM-DAT/diode-dat/diode-dat.md
			
          @@ -1,3 +1,7 @@

           # diode-dat

          +| model  | footprint | mark    |

          +| ------ | --------- | ------- |

          +| SS14   | SMA       | SS14/SL |

          +| 1N4007 | SMA       | M7      |

				Tech-dat/EDA-dat/kicad-dat/kicad-dat.md
			
          @@ -3,7 +3,7 @@

           - lib 旧版 符号文件

          -- [[kicad-workflow]] - [[kidcad-data-dat]]

          +- [[kicad-workflow]] - [[kicad-plugin-dat]]

				Tech-dat/EDA-dat/kicad-dat/kicad-plugin-dat/kicad-plugin-dat.md
			
          @@ -1,9 +1,7 @@

           # kicad-plugin

          -- freerouting - https://hackaday.com/2023/04/14/kicad-autorouting-made-easy/

          -

          -![](2024-09-22-03-39-54.png)

          +## testing 

           - interactive html bom 

           - pcb-action-tools

          @@ -27,7 +25,6 @@

           - impart gui for kicad 

           - gerber to order 

           - hide references 

          -- schematic blocks plug-in

           - KLEPlacement 

           - hierarchicalPCB

           - sparkfun kicad panelizer 

          @@ -48,8 +45,14 @@

           - parts placer 

           - set hole diameter 

           - via patterns 

          +- schematic blocks plug-in

          +## useful 

          +

          +- freerouting - https://hackaday.com/2023/04/14/kicad-autorouting-made-easy/

          +

          +![](2024-09-22-03-39-54.png)

           ## install java TLS version

				Tech-dat/EDA-dat/kicad-dat/kidcad-workflow/kicad-workflow.md
			
          @@ -30,7 +30,7 @@

           - autoroute - by [[kicad-plugin-dat]]

          -

          +- ground pour 

          @@ -57,3 +57,6 @@ commom layers

           - 网格 1.0 mm 

           - 缩放 

          +## ref 

          +

          +- [[kicad-workflow]] - [[kicad]]

          \ No newline at end of file

				Tech-dat/actuator-dat/relay-dat/relay-dat.md
			
          @@ -12,7 +12,7 @@ HF32F-G-5-HS

          -### SPDT Relay 

          +### Relay types and vendors 

           - [[songle-dat]] - [[hongfa-dat]] - [[omron-dat]]

          @@ -25,7 +25,41 @@ using N-mos mosfet control

           ![](2024-09-18-17-41-35.png)

          +### fly back diode 

          +A flyback diode (also known as a freewheeling diode or reverse protection diode) is used to protect a relay or other inductive loads. When the relay coil is de-energized, it generates a high voltage reverse current (called back EMF) due to its inductive nature. This reverse current can damage other components in the control circuit.

          +

          +To prevent this, a flyback diode is typically placed in parallel with the relay coil. The diode allows normal current to flow through the coil when the relay is energized, but when the relay is turned off, the diode provides a low-resistance path for the stored energy to dissipate, preventing the high voltage spike from damaging the circuit.

          +

          +### how to choose fly back diode 

          +

          +- [[diode-dat]]

          +

          +Choosing the right flyback diode involves considering the following key factors:

          +

          +1. Diode Type:

          +Standard diodes like 1N4007 are commonly used for slower switching relays.

          +Fast recovery diodes like 1N5819 or Schottky diodes may be necessary if the relay is switching quickly or if you need fast recovery times.

          +

          +2. Voltage Rating:

          +The reverse voltage rating of the diode should be at least twice the supply voltage to ensure the diode can handle the reverse voltage spikes from the inductive load. For example, if the relay operates on a 12V supply, a diode with a voltage rating of at least 24V is recommended.

          +

          +3. Current Rating:

          +The current rating of the diode should be equal to or greater than the current flowing through the relay coil. To determine the required current rating, check the current drawn by the relay's coil (usually provided in the relay datasheet). Choose a diode that can handle this current continuously.

          +

          +4. Switching Speed:

          +If the relay operates at high switching frequencies, you may need a diode with fast recovery characteristics. Schottky diodes, for instance, have lower forward voltage drop and faster switching times, making them ideal for high-speed applications.

          +

          +5. Power Dissipation:

          +Ensure that the diode can handle the power dissipation, which is a function of the voltage drop across the diode and the current passing through it. Diodes with low forward voltage (like Schottky diodes) can help minimize power loss.

          +

          +6. Package Type:

          +Choose a package type (e.g., through-hole or surface-mount) based on your circuit design and the space available on the PCB.

          +

          +Example Selection:

          +

          +For a 12V relay drawing 0.5A, a 1N4007 diode (rated for 1000V, 1A) would be a suitable and cost-effective choice for general applications.

          +For fast-switching applications, a 1N5819 Schottky diode (rated 40V, 1A) might be a better option due to its fast recovery time and lower forward voltage.

           ## ref

...	...	@@ -1,3 +1,7 @@
1	1
2	2	# diode-dat
3	3
	4	+\| model \| footprint \| mark \|
	5	+\| ------ \| --------- \| ------- \|
	6	+\| SS14 \| SMA \| SS14/SL \|
	7	+\| 1N4007 \| SMA \| M7 \|

...	...	@@ -3,7 +3,7 @@
3	3
4	4	- lib 旧版符号文件
5	5
6		-- [[kicad-workflow]] - [[kidcad-data-dat]]
	6	+- [[kicad-workflow]] - [[kicad-plugin-dat]]
7	7
8	8
9	9

...	...	@@ -1,9 +1,7 @@
1	1
2	2	# kicad-plugin
3	3
4		-- freerouting - https://hackaday.com/2023/04/14/kicad-autorouting-made-easy/
5		-
6		-![](2024-09-22-03-39-54.png)
	4	+## testing
7	5
8	6	- interactive html bom
9	7	- pcb-action-tools
...	...	@@ -27,7 +25,6 @@
27	25	- impart gui for kicad
28	26	- gerber to order
29	27	- hide references
30		-- schematic blocks plug-in
31	28	- KLEPlacement
32	29	- hierarchicalPCB
33	30	- sparkfun kicad panelizer
...	...	@@ -48,8 +45,14 @@
48	45	- parts placer
49	46	- set hole diameter
50	47	- via patterns
	48	+- schematic blocks plug-in
51	49
52	50
	51	+## useful
	52	+
	53	+- freerouting - https://hackaday.com/2023/04/14/kicad-autorouting-made-easy/
	54	+
	55	+![](2024-09-22-03-39-54.png)
53	56
54	57
55	58	## install java TLS version

...	...	@@ -30,7 +30,7 @@
30	30
31	31	- autoroute - by [[kicad-plugin-dat]]
32	32
33		-
	33	+- ground pour
34	34
35	35
36	36
...	...	@@ -57,3 +57,6 @@ commom layers
57	57	- 网格 1.0 mm
58	58	- 缩放
59	59
	60	+## ref
	61	+
	62	+- [[kicad-workflow]] - [[kicad]]
...	...	\ No newline at end of file

...	...	@@ -12,7 +12,7 @@ HF32F-G-5-HS
12	12
13	13
14	14
15		-### SPDT Relay
	15	+### Relay types and vendors
16	16
17	17
18	18	- [[songle-dat]] - [[hongfa-dat]] - [[omron-dat]]
...	...	@@ -25,7 +25,41 @@ using N-mos mosfet control
25	25
26	26	![](2024-09-18-17-41-35.png)
27	27
	28	+### fly back diode
28	29
	30	+A flyback diode (also known as a freewheeling diode or reverse protection diode) is used to protect a relay or other inductive loads. When the relay coil is de-energized, it generates a high voltage reverse current (called back EMF) due to its inductive nature. This reverse current can damage other components in the control circuit.
	31	+
	32	+To prevent this, a flyback diode is typically placed in parallel with the relay coil. The diode allows normal current to flow through the coil when the relay is energized, but when the relay is turned off, the diode provides a low-resistance path for the stored energy to dissipate, preventing the high voltage spike from damaging the circuit.
	33	+
	34	+### how to choose fly back diode
	35	+
	36	+- [[diode-dat]]
	37	+
	38	+Choosing the right flyback diode involves considering the following key factors:
	39	+
	40	+1. Diode Type:
	41	+Standard diodes like 1N4007 are commonly used for slower switching relays.
	42	+Fast recovery diodes like 1N5819 or Schottky diodes may be necessary if the relay is switching quickly or if you need fast recovery times.
	43	+
	44	+2. Voltage Rating:
	45	+The reverse voltage rating of the diode should be at least twice the supply voltage to ensure the diode can handle the reverse voltage spikes from the inductive load. For example, if the relay operates on a 12V supply, a diode with a voltage rating of at least 24V is recommended.
	46	+
	47	+3. Current Rating:
	48	+The current rating of the diode should be equal to or greater than the current flowing through the relay coil. To determine the required current rating, check the current drawn by the relay's coil (usually provided in the relay datasheet). Choose a diode that can handle this current continuously.
	49	+
	50	+4. Switching Speed:
	51	+If the relay operates at high switching frequencies, you may need a diode with fast recovery characteristics. Schottky diodes, for instance, have lower forward voltage drop and faster switching times, making them ideal for high-speed applications.
	52	+
	53	+5. Power Dissipation:
	54	+Ensure that the diode can handle the power dissipation, which is a function of the voltage drop across the diode and the current passing through it. Diodes with low forward voltage (like Schottky diodes) can help minimize power loss.
	55	+
	56	+6. Package Type:
	57	+Choose a package type (e.g., through-hole or surface-mount) based on your circuit design and the space available on the PCB.
	58	+
	59	+Example Selection:
	60	+
	61	+For a 12V relay drawing 0.5A, a 1N4007 diode (rated for 1000V, 1A) would be a suitable and cost-effective choice for general applications.
	62	+For fast-switching applications, a 1N5819 Schottky diode (rated 40V, 1A) might be a better option due to its fast recovery time and lower forward voltage.
29	63
30	64	## ref
31	65