TZXDuino pico - Revision history

Mahjongg: /* July 14, 2023 corrected level converters for TZXDuino-pico revision 1,3 */

2023-07-14T18:00:00Z

July 14, 2023 corrected level converters for TZXDuino-pico revision 1,3

← Older revision		Revision as of 18:00, 14 July 2023
Line 74:		Line 74:

	the new schematic [[File:TZXDuino pico schematic rev 1.3.pdf]]		the new schematic [[File:TZXDuino pico schematic rev 1.3.pdf]]

			the new preview of revision 1.3. All files are uploaded to gitHub.

			[[File:TZXDuino pico preview revision 1.3.jpg\|1000px]]

Mahjongg: /* July 14, 2023 corrected level converters for TZXDuino-pico revision 1,3 */

2023-07-14T17:58:03Z

July 14, 2023 corrected level converters for TZXDuino-pico revision 1,3

← Older revision		Revision as of 17:58, 14 July 2023
Line 72:		Line 72:

	Revision 1.3 corrects this.		Revision 1.3 corrects this.

			the new schematic [[File:TZXDuino pico schematic rev 1.3.pdf]]

Mahjongg: /* july 14, 2023 corrected level converters for TZXDuino-pico revision 1,3 */

2023-07-14T17:55:33Z

july 14, 2023 corrected level converters for TZXDuino-pico revision 1,3

← Older revision		Revision as of 17:55, 14 July 2023
Line 61:		Line 61:

	here is a picture of the top of the PCB, so you can see how easy the soldering of the sd-card holder will be. Note that the bottom left pad is not connected to anything, as it is only for mechanical strength, but other pads connected to the shell (top left) are grounded, so the shell is also shielded.		here is a picture of the top of the PCB, so you can see how easy the soldering of the sd-card holder will be. Note that the bottom left pad is not connected to anything, as it is only for mechanical strength, but other pads connected to the shell (top left) are grounded, so the shell is also shielded.


	The electrical pads from left to right are 1,2,3,4,5,6, and 7 (pad 1 and pad 8 are not connected).		The electrical pads from left to right are 1,2,3,4,5,6, and 7 (pad 1 and pad 8 are not connected).

	[[File:Preview top copper of TZXDuino-pico.png]]		[[File:Preview top copper of TZXDuino-pico.png]]

			== July 14, 2023 corrected level converters for TZXDuino-pico revision 1,3 ==

			I was busy with my rhococo design when I noticed a mistake I made in the TZXDuino PICO, the resistor dividers for vonverting 5V levels to 3V3 levels were "backwards", !

			Revision 1.3 corrects this.

Mahjongg at 01:49, 5 March 2023

2023-03-05T01:49:48Z

← Older revision		Revision as of 01:49, 5 March 2023
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	\|Picture=TZXDuino-pico_preview.png		\|Picture=TZXDuino-pico_preview.png
	\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum		\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum
	\|Status=~~Finished~~		\|Status=Completed
	\|Contact=mahjongg		\|Contact=mahjongg
	}}		}}

Mahjongg at 01:49, 5 March 2023

2023-03-05T01:49:09Z

← Older revision		Revision as of 01:49, 5 March 2023
Line 3:		Line 3:
	\|Picture=TZXDuino-pico_preview.png		\|Picture=TZXDuino-pico_preview.png
	\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum		\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum
	\|Status=~~In progress~~		\|Status=Finished
	\|Contact=mahjongg		\|Contact=mahjongg
	}}		}}

Mahjongg: /* January 10, 2023 Re-did as TZXDuino-pico revision 1,2 */

2023-01-10T16:55:58Z

January 10, 2023 Re-did as TZXDuino-pico revision 1,2

← Older revision		Revision as of 16:55, 10 January 2023
Line 61:		Line 61:

	here is a picture of the top of the PCB, so you can see how easy the soldering of the sd-card holder will be. Note that the bottom left pad is not connected to anything, as it is only for mechanical strength, but other pads connected to the shell (top left) are grounded, so the shell is also shielded.		here is a picture of the top of the PCB, so you can see how easy the soldering of the sd-card holder will be. Note that the bottom left pad is not connected to anything, as it is only for mechanical strength, but other pads connected to the shell (top left) are grounded, so the shell is also shielded.

			The electrical pads from left to right are 1,2,3,4,5,6, and 7 (pad 1 and pad 8 are not connected).

	[[File:Preview top copper of TZXDuino-pico.png]]		[[File:Preview top copper of TZXDuino-pico.png]]

Mahjongg: /* January 10, 2023 Re-did as TZXDuino-pico revision 1,2 */

2023-01-10T16:53:39Z

January 10, 2023 Re-did as TZXDuino-pico revision 1,2

← Older revision		Revision as of 16:53, 10 January 2023
Line 59:		Line 59:
	Start soldering with the SD-Card holder, solder the six (of the eight available) contact pads, the outer two pins are not used), and at least one of the solder pads connected to the metal shell, for example the pad next to the top left one (next to the H1 text) and the bottom left one, so the card holder is mechanically stable soldered to the PCB.		Start soldering with the SD-Card holder, solder the six (of the eight available) contact pads, the outer two pins are not used), and at least one of the solder pads connected to the metal shell, for example the pad next to the top left one (next to the H1 text) and the bottom left one, so the card holder is mechanically stable soldered to the PCB.
	The Arduino-nano does not have to be socketed if you need to have as low a profile as possible, but not having a socket makes removing the Arduino nearly impossible, so if a low profile is not needed use a socket. in this version I indicated that the Arduino's USB connector is oriented on top. Pin 1 of the Arduino is on the bottom right.		The Arduino-nano does not have to be socketed if you need to have as low a profile as possible, but not having a socket makes removing the Arduino nearly impossible, so if a low profile is not needed use a socket. in this version I indicated that the Arduino's USB connector is oriented on top. Pin 1 of the Arduino is on the bottom right.

			here is a picture of the top of the PCB, so you can see how easy the soldering of the sd-card holder will be. Note that the bottom left pad is not connected to anything, as it is only for mechanical strength, but other pads connected to the shell (top left) are grounded, so the shell is also shielded.

			[[File:Preview top copper of TZXDuino-pico.png]]

Mahjongg at 15:32, 10 January 2023

2023-01-10T15:32:09Z

← Older revision		Revision as of 15:32, 10 January 2023
Line 1:		Line 1:
	{{Project		{{Project
	\|Name=TZXDuino Pico		\|Name=TZXDuino Pico
	\|~~Afbeelding~~=TZXDuino-pico_preview.png		\|Picture=TZXDuino-pico_preview.png
	\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum		\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum
	\|Status=In progress		\|Status=In progress

Mahjongg at 15:31, 10 January 2023

2023-01-10T15:31:19Z

← Older revision		Revision as of 15:31, 10 January 2023
Line 1:		Line 1:
	{{Project		{{Project
	\|Name=TZXDuino Pico		\|Name=TZXDuino Pico
			\|Afbeelding=TZXDuino-pico_preview.png
	\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum		\|Omschrijving=building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum
	\|Status=In progress		\|Status=In progress

Mahjongg: /* January 10, 2023 Re-did as TZXDuino-pico revision 1,2 */

2023-01-10T15:27:24Z

January 10, 2023 Re-did as TZXDuino-pico revision 1,2

← Older revision		Revision as of 15:27, 10 January 2023
Line 52:		Line 52:
	[[File:TZXDuino-pico preview.png]]		[[File:TZXDuino-pico preview.png]]

	as you can see the sd-card is now oriented with the card slot on top, and resistors are smaller with three 0805 1K8 resistors in the top row, and three 3K3 resistors in the bottom row. The card holder is an Hirose DM3D-SF (see farnell https://nl.farnell.com/hirose-hrs/dm3d-sf/connector-micro-sd-push-pull-smt/dp/1764377?st=1764377 )		as you can see the sd-card is now oriented with the card slot on top, and resistors are smaller with three 0805 1K8 resistors in the top row, and three 3K3 resistors in the bottom row. The card holder is an Hirose DM3D-SF (see farnell https://nl.farnell.com/hirose-hrs/dm3d-sf/connector-micro-sd-push-pull-smt/dp/1764377?st=1764377 , or mouser https://nl.mouser.com/ProductDetail/Hirose-Connector/DM3D-SF?qs=nSryOFbzj8L3f0GFYlvXkw%3D%3D )

	I used two T 113A RT buttons (with different color knobs) connected to the NEXT (J2) and PLAY (J3) connections (the 6 x 6 mm buttons SW1 and SW2) are optional). J4 goes to the EAR 3.5 mm connector, make sure the cable is not reversed, so that the top (GND) pin (PIN-1) goes to the GND connection of the EAR plug, and the bottom signal pin goes to the audio in pin of the 3.5mm jack (the pin farthest into the spectrum, connecting to the TIP of a mono 3.5mm jack). If you revert the two connections you short the audio to ground. Solder to the bottom PCB side of the 3.5mm jack, not on the top metal, as this will damage the jack.		I used two T 113A RT buttons (with different color knobs) connected to the NEXT (J2) and PLAY (J3) connections (the 6 x 6 mm buttons SW1 and SW2) are optional). J4 goes to the EAR 3.5 mm connector, make sure the cable is not reversed, so that the top (GND) pin (PIN-1) goes to the GND connection of the EAR plug, and the bottom signal pin goes to the audio in pin of the 3.5mm jack (the pin farthest into the spectrum, connecting to the TIP of a mono 3.5mm jack). If you revert the two connections you short the audio to ground. Solder to the bottom PCB side of the 3.5mm jack, not on the top metal, as this will damage the jack.
	J5 is used for a start/stop connection, and can be used to auto start playback when you build the TZXDuino-pico into a computer with a built in cassette deck, it is not normally used with a sinclair spectrum 16K 48K or 128K. J1 is a combined 4-pole connector, that can be, but not must be, connected to a display. And J6 optionally connects to the complete set of six buttons if you desire to built a normal TZXDuino from this base model. J1 also is used to power the TZXDuino with 5Volt from within the Spectrum, make sure to not swap +5V and GND! The left most pin of J1 (square pad) is GND, pin-2 , the next pin is for the +5V connection.		J5 is used for a start/stop connection, and can be used to auto start playback when you build the TZXDuino-pico into a computer with a built in cassette deck, it is not normally used with a sinclair spectrum 16K 48K or 128K. J1 is a combined 4-pole connector, that can be, but not must be, connected to a display. And J6 optionally connects to the complete set of six buttons if you desire to built a normal TZXDuino from this base model. J1 also is used to power the TZXDuino with 5Volt from within the Spectrum, make sure to not swap +5V and GND! The left most pin of J1 (square pad) is GND, pin-2 , the next pin is for the +5V connection.
	Start soldering with the SD-Card holder, solder the six (of the eight available) contact pads, the outer two pins are not used), and at least one of the solder pads connected to the metal shell, for example the pad next to the top left one (next to the H1 text) and the bottom left one, so the card holder is mechanically stable soldered to the PCB.		Start soldering with the SD-Card holder, solder the six (of the eight available) contact pads, the outer two pins are not used), and at least one of the solder pads connected to the metal shell, for example the pad next to the top left one (next to the H1 text) and the bottom left one, so the card holder is mechanically stable soldered to the PCB.
	The Arduino-nano does not have to be socketed if you need to have as low a profile as possible, but not having a socket makes removing the Arduino nearly impossible, so if a low profile is not needed use a socket. in this version I indicated that the Arduino's USB connector is oriented on top. Pin 1 of the Arduino is on the bottom right.		The Arduino-nano does not have to be socketed if you need to have as low a profile as possible, but not having a socket makes removing the Arduino nearly impossible, so if a low profile is not needed use a socket. in this version I indicated that the Arduino's USB connector is oriented on top. Pin 1 of the Arduino is on the bottom right.