usbXR

by visakhanc.

2 layer board of 0.99x0.66 inches (25.10x16.64 mm).
Shared on November 18th, 2017 16:59.

Low cost USB Wireless Transceiver

See the project details at github

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T200 Dual RAM Module V2.1

by Stardust.

2 layer board of 1.01x1.41 inches (25.55x35.71 mm).
Shared on November 18th, 2017 16:06.

T200 Dual RAM Board

This board will provide 2x24K banks of SRAM for the Tandy T200 by using only one socket. Ideal if you do not have banks 2 or 3.

Materials

  1. U1: IC, 128Kx8 SRAM, Digi-key 428-3828-1-ND 727-CY62128ELL45ZXIT or 706-1042-ND IS62C1024AL-35TLI Other TSOP1 128Kx8 SRAMs would also work. They need to be able to operate with 5V CMOS logic.
  2. U3: AND Gate, Digi-key1727-4115-1-ND
  3. CTS 2180 ETAME Pins for insertion into IC socket. Digikey A117856CT-ND

Ordering information is provided for guidance only. The parts should be widely available from other suppliers.

How to use the IC Pins (CTS 2180)

The pins used for inserting the module into the T200 IC socket are similar to IC pins and should not cause any problems with the socket. The use of square or even turned pins is not recommended with the T200 sockets. The pins are used in a slightly different way to the usual method shown in their datasheet, they are normally used for mounting SIL boards vertically via their edge.

A 0.6" wide DIP socket is also required as a jig to hold the pins while soldering. A 0.7" wide DIP socket would be ideal but they are hard to find.

  1. Cut a strip of pins to the required length, 14 pins per side in this case. Leave on the top and bottom rails.
  2. Snip the pins off close to the bottom rail trying to keep them the same length.
  3. With one row of holes aligned with the socket insert the pins from the top through the PCB holes into the socket pins. Make sure the pins are firmly pressed into the socket. This will give the required length of pins for the socket.
  4. Solder the pins on the top of the PCB. Once all the pins are soldered the PCB can be removed from the socket.
  5. Snap off the top rail (it will breakaway) and snip off the pin heads close to the top of PCB to leave a clean surface on the top of the board.
  6. Repeat for the other row of pins. If you have a 0.7" wide 28pin DIP socket you could do both rows together.
  7. The single pin used to connect to Opt RAM #1 has to be soldered so that is in the same direction as the other pins. The same method can be used as for the 14pin rows.

There will be about 125mil (3.2mm) of pin below the board ready to insert in the socket. The memory module should fit cleanly into the socket and allow the memory cover to be replaced. Take care when inserting the module to make sure the single pin is also aligned with the Opt RAM 1 socket.

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Continuity Tester

by johnsondavies.

2 layer board of 1.75x0.40 inches (44.45x10.16 mm).
Shared on November 18th, 2017 15:13.

A simple continuity tester based on an ATtiny85 and a piezo buzzer. See http://www.technoblogy.com/show?1YON.

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Tandy T200 Single RAM module V2.0

by Stardust.

2 layer board of 0.83x1.41 inches (20.96x35.71 mm).
Shared on November 18th, 2017 02:18.

T200 Single RAM Board

This board will provide a single 24K bank of SRAM for the Tandy T200. Useful if you want to add one more bank or replace your current memory with a lower power version or a failed module.

Materials

  1. R1, R2: Resistor, 47K (0805), Digikey 311-47KARCT-ND
  2. Q1: FET, 2N7002, Digikey 2N7002T-FDICT-ND
  3. U2: IC, 32Kx8 SRAM, Mouser 913-AS6C62256-55SCN Equivalent 32Kx8 SRAM should work, they need to operate from 5V and work with 5V CMOS logic.
  4. CTS 2180 ETAME Pins for insertion into IC socket. Digikey A117856CT-ND

Ordering information is provided for guidance only. The parts should be widely available from other suppliers.

How to use the IC Pins (CTS 2180)

The pins used for inserting the module into the T200 IC socket are similar to IC pins and should not cause any problems with the socket. The use of square or even turned pins is not recommended with the T200 sockets. The pins are used in a slightly different way to the usual method shown in their datasheet, they are normally used for mounting SIL boards vertically via their edge.

A 0.6" wide DIP socket is also required as a jig to hold the pins while soldering. A 0.7" wide DIP socket would be ideal but they are hard to find.

  1. Cut a strip of pins to the required length, 14 pins per side in this case. Leave on the top and bottom rails.
  2. Snip the pins off close to the bottom rail trying to keep them the same length.
  3. With one row of holes aligned with the socket insert the pins from the top through the PCB holes into the socket pins. Make sure the pins are firmly pressed into the socket. This will give the required length of pins for the socket.
  4. Solder the pins on the top of the PCB. Once all the pins are soldered the PCB can be removed from the socket.
  5. Snap off the top rail (it will breakaway) and snip off the pin heads close to the top of PCB to leave a clean surface on the top of the board.
  6. Repeat for the other row of pins. If you have a 0.7" wide 28pin DIP socket you could do both rows together.

There will be about 125mil (3.2mm) of pin below the board ready to insert in the socket. The memory module should fit cleanly into the socket and allow the memory cover to be replaced.

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HDMI_QSB_new_aliexpress.zip

by citrus3000psi.

2 layer board of 0.90x0.72 inches (22.81x18.19 mm).
Shared on November 18th, 2017 02:08.

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