RTC7301 Refit
2 layer board of 0.40 x 0.90 inches (10.2 x 22.9 mm)
Uploaded:
January 19, 2020
Shared:
October 18, 2021
Total Price:
$1.80
Small board to replace Epson RTG7301DG with Maxim DS3232M. Unused pins 16,17 were used for SDA and VBat, and pin 1 is now SCL.
Small board to replace Epson RTG7301DG with Maxim DS3232M. Unused pins 16,17 were used for SDA and VBat, and pin 1 is now SCL.
HP28S_battery.kicad_pcb
2 layer board of 1.03 x 0.48 inches (26.1 x 12.1 mm)
Uploaded:
September 29, 2021
Shared:
October 18, 2021
Total Price:
$2.40
LiPo charger for use inside an HP 28S calculator as part of a LiPo battery upgrade. Project details and support files can be found at the Hackaday project page. <https://hackaday.io/project/181957-hp-28s-lipo-battery>
LiPo charger for use inside an HP 28S calculator as part of a LiPo battery upgrade. Project details and support files can be found at the Hackaday project page. <https://hackaday.io/project/181957-hp-28s-lipo-battery>
MAX7128_JTAG_Tester.kicad_pcb
2 layer board of 3.00 x 2.30 inches (76.2 x 58.5 mm)
Uploaded:
January 23, 2020
Shared:
February 06, 2020
Total Price:
$34.55
3M Textool ZIF PLCC84 socket for easily checking/flashing EPM7128S and EPM7160S CPLD devices. (Many from eBay have JTAG disabled - this is to test them without soldering!)
R1/D1 are LED and bias R2-R5 are 1K C1 is 33uF 6.3mm cap C2-C7 are 100nF U1 is AP1117-5.0v reg D1 is any 1A rectifie…
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3M Textool ZIF PLCC84 socket for easily checking/flashing EPM7128S and EPM7160S CPLD devices. (Many from eBay have JTAG disabled - this is to test them without soldering!)
R1/D1 are LED and bias R2-R5 are 1K C1 is 33uF 6.3mm cap C2-C7 are 100nF U1 is AP1117-5.0v reg D1 is any 1A rectifie…
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HP5328 OCXO Upgrade
2 layer board of 2.51 x 2.51 inches (63.8 x 63.8 mm)
Uploaded:
April 19, 2015
Shared:
June 13, 2015
Total Price:
$31.50
Supports the common 8663HS OCXO, and provides precision 10 MHz reference for an HP5328 frequency counter.
<https://hackaday.io/project/6278-hp5328-counter-ocxo-replacement>
<https://github.com/tomcircuit/derbylink>
Supports the common 8663HS OCXO, and provides precision 10 MHz reference for an HP5328 frequency counter.
<https://hackaday.io/project/6278-hp5328-counter-ocxo-replacement>
<https://github.com/tomcircuit/derbylink>
HD6309 SBC
2 layer board of 6.31 x 3.95 inches (160.3 x 100.2 mm)
Uploaded:
December 31, 2013
Shared:
April 08, 2014
Total Price:
$124.50
HD6309 single board computer. Files at github under tomcircuit. Also at hackaday projects under user tomcircuit.
HD6309 single board computer. Files at github under tomcircuit. Also at hackaday projects under user tomcircuit.
