Wien Bridge Oscillator Rev. 1.2 HPV
2 layer board of 1.15 x 1.16 inches (29.2 x 29.5 mm)
Uploaded:
August 31, 2019
Shared:
June 20, 2020
Total Price:
$6.65
Low distortion Wien Bridge Oscillator - High Performance Version. Selected values for 400 Hz frequency output at 26 volts peak to peak. C1, C2 are precision film capacitors for low drift and distortion. IC1 is an OPA1612 ultra-low noise and distortion audio op-amp. VR4 is an external 10K potentio…
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Low distortion Wien Bridge Oscillator - High Performance Version. Selected values for 400 Hz frequency output at 26 volts peak to peak. C1, C2 are precision film capacitors for low drift and distortion. IC1 is an OPA1612 ultra-low noise and distortion audio op-amp. VR4 is an external 10K potentio…
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HP3456A-C5 Adapter Rev 1.1
2 layer board of 1.22 x 1.22 inches (31.1 x 31.1 mm)
Uploaded:
June 20, 2020
Shared:
June 20, 2020
Total Price:
$7.45
Hewlett Packard 3456A Digital Voltmeter C5 Capacitor Adapter for A10 Board. Replaces the 4,000 uF @ 15 volts capacitor with 4,800 uF @ 25 volts, using 4 1,200 uF capacitors. Impedance 4.25 mOhms. Replaced obsolete Sprague 5 pin unit. Revision 1.1 <https://www.barbouri.com/2020/06/24/hewlett-pack…
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Hewlett Packard 3456A Digital Voltmeter C5 Capacitor Adapter for A10 Board. Replaces the 4,000 uF @ 15 volts capacitor with 4,800 uF @ 25 volts, using 4 1,200 uF capacitors. Impedance 4.25 mOhms. Replaced obsolete Sprague 5 pin unit. Revision 1.1 <https://www.barbouri.com/2020/06/24/hewlett-pack…
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Dual Regulator Ver. 1.0
2 layer board of 1.00 x 0.99 inches (25.4 x 25.1 mm)
Uploaded:
September 16, 2019
Shared:
November 04, 2019
Total Price:
$4.90
Dual Bi-Polar Voltage Regulator +/- 15 volts at 150 mA. Maximum +/- 20 volt Input Maximum LT3032 Connect SHDN: to IPS to turn on, and GND to turn off
<https://www.barbouri.com/2019/11/03/ultra-low-thd-sine-wave-generator/> 
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Dual Bi-Polar Voltage Regulator +/- 15 volts at 150 mA. Maximum +/- 20 volt Input Maximum LT3032 Connect SHDN: to IPS to turn on, and GND to turn off
<https://www.barbouri.com/2019/11/03/ultra-low-thd-sine-wave-generator/> 
2 layer board of 1.97 x 2.17 inches (50.0 x 55.1 mm)
Uploaded:
August 17, 2019
Shared:
August 17, 2019
Total Price:
$21.35
Battery Capacity Tester - Removed optional capacitor, updated component values, changed footprint of 2.5V reference, added additional MOSFET text. Version 2.4
<https://www.barbouri.com/2019/08/17/battery-capacity-tester/> 
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Battery Capacity Tester - Removed optional capacitor, updated component values, changed footprint of 2.5V reference, added additional MOSFET text. Version 2.4
<https://www.barbouri.com/2019/08/17/battery-capacity-tester/> 
2 layer board of 2.20 x 2.00 inches (55.9 x 50.7 mm)
Uploaded:
August 07, 2019
Shared:
August 07, 2019
Total Price:
$21.95
Millivolt Meter Version 2.11 board. Dual range relay, Isolated SPI and relay control, Low dropout power supply, PTC input fuse, Voltage reference thermal relief slots
<https://www.barbouri.com/2019/08/07/millivolt-meter-version-2/> 
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Millivolt Meter Version 2.11 board. Dual range relay, Isolated SPI and relay control, Low dropout power supply, PTC input fuse, Voltage reference thermal relief slots
<https://www.barbouri.com/2019/08/07/millivolt-meter-version-2/> 