Shared Projects by rfmerrill

Shared Projects by rfmerrill

My Projects

PLCC 42-pin ROM replacement

4 layer board of 0.70 x 2.14 inches (17.8 x 54.4 mm)
Uploaded: June 19th 2021
Shared: October 11th 2021
Total Price: $14.90

This allows you to replace a 40 or 42-pin ROM or EPROM with a 27C322-like footprint, using PLCC NOR flash chips that are still in production.

This allows you to replace a 40 or 42-pin ROM or EPROM with a 27C322-like footprint, using PLCC NOR flash chips that are still in production.

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Genesis PLCC homebrew cart P1

2 layer board of 3.30 x 1.70 inches (83.9 x 43.1 mm)
Uploaded: June 20th 2021
Shared: July 4th 2021
Total Price: $28.00

This allows you to use a pair of PLCC NOR FLASH EEPROMs for a genesis cart up to 1 megabyte. The advantage of this over existing solutions is that it fits in…

This allows you to use a pair of PLCC NOR FLASH EEPROMs for a genesis cart up to 1 megabyte. The advantage of this over existing solutions is that it fits in…

Embeddable link to order this shared Project

Pulse Generator r3

2 layer board of 1.10 x 1.07 inches (28.0 x 27.2 mm)
Uploaded: March 13th 2021
Shared: May 8th 2021
Total Price: $5.90

using AUC logic and smaller components

C2: 0.047u for ~3.5 kHz, 1u for ~170 Hz

C1, C3-C9: 10u

R1: 6.8kohm

R2-R6: 220 ohm, lowest inductance possi…

using AUC logic and smaller components

C2: 0.047u for ~3.5 kHz, 1u for ~170 Hz

C1, C3-C9: 10u

R1: 6.8kohm

R2-R6: 220 ohm, lowest inductance possi…

Embeddable link to order this shared Project

74AC14 Pulse Generator r2

2 layer board of 0.54 x 1.27 inches (13.8 x 32.2 mm)
Uploaded: February 2nd 2021
Shared: February 20th 2021
Total Price: $3.40

Bigger track version.

J1 fits a particular board edge SMA connector I bought from amazon. Make sure you can find one that fits.

U1 is a 74AC14.

R2-R…

Bigger track version.

J1 fits a particular board edge SMA connector I bought from amazon. Make sure you can find one that fits.

U1 is a 74AC14.

R2-R…

Embeddable link to order this shared Project

Yubikey C-To-A adapter v2

4 layer board of 0.99 x 0.56 inches (25.2 x 14.1 mm)
Uploaded: February 4th 2021
Shared: February 4th 2021
Total Price: $5.50

A compact and light adapter allowing you to use a Yubikey 5c as conveniently as the classic Yubikey.

Requires two resistors and a USB C port, plus a non-c…

A compact and light adapter allowing you to use a Yubikey 5c as conveniently as the classic Yubikey.

Requires two resistors and a USB C port, plus a non-c…

Embeddable link to order this shared Project