Cphp82001

calcpsu·cphp82001·cphp82001-pcb/cphp82001-pcb.kicad_pcb

Cphp82001 is an open source PCB design by calcpsu: a 2-layer, 56 × 44 mm board with 26 components (24 distinct parts). It is built around the BQ21040, MAX40203AUK, APX810-44SA, APX809S-31SA and more. Filed under power & battery.

CalcPack replacement for HP 82001, suits HP35/45/55/65/67 calculators

A Li-Po battery replacement design for HP35/HP45/HP55/HP65/HP67 calculators. The original batteries had ~ 500mAh capacity, while modern Ni-MH replacements are typically ~1500mAh.

Li-Po has the advantage of far reduced self-discharge in comparison to Ni-MH, which is an advantage for an intermittently-used device. Even with similar mAh capacity, we can expect longer battery life.

Cphp82001, from the project README — From the project README

Built around

BQ21040 MAX40203AUK APX810-44SA APX809S-31SA NCP360SNT NCP380HSN05

Parts list

26 components, 24 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	BQ21040	SOT-23-6_TI_DBV6	U1
1	MAX40203AUK	SOT-23-5_TI_DBV5	U3
1	APX810-44SA	SOT-23-3	U4
1	APX809S-31SA	SOT-23-3	U5
1	NCP360SNT	SOT-23-5_TI_DBV5	U6
1	NCP380HSN05	SOT-23-5_TI_DBV5	U7
1	2N7002	SOT-23	Q1
1	AO3413	SOT-23	Q2
1	USB	AMPHENOL_10118194-0001LF	J1
1	PAD+	PAD_8x15	J2
1	PAD-	PAD_8x15	J3
1	Batt	JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical_13PADS	BT1
1	PMEG40T10ERX	D_SOD-123	D1
1	5V6/3W	D_SMA	D2
1	RED	LED_0805_2012Metric	D3
1	1N4148W	D_SOD-123	D4
3	1u	C_0805_2012Metric	C1, C4, C6
1	4U7 4u7	C_0805_2012Metric	C5
1	10U 10u	C_0805_2012Metric	C7
1	1K8 1k8	R_0805_2012Metric	R1

Show 4 more

Qty	Part	Footprint	Refs
1	3k	R_0805_2012Metric	R2
1	9K1 9k1	R_0805_2012Metric	R8
1	33K 33k	R_0805_2012Metric	R9
1	10K 10k	R_0805_2012Metric	R13

Cphp82001

Built around

Parts list

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