Shared Projects by Blueberry

A 2-way active crossover for one channel. Crossover frequency is set for 2250 Hz.

Revised One Watt audio amplifier with a Mini USB port and a IS31AP4991A amplifier. C1 thru C3 are 1uF ceramic caps, C4 is a 100uF electrolytic. R1 thru R3 are 4.7k-ohm resistors. R4 and R5 are 47k-ohm for a gain of 10 (20 dB) on the amplifier. As in the previous one-watt amplifier, a stereo signal from the 3.5mm jack is combined into a mono signal using a simple resistor network. The USB input is only used as a 5-volt power source.

An amplifier for a single speaker in a linear array. Uses differential inputs. Based on the IS31AP4991A chip. (Note the “A” suffix denotes a different pinout than those without the suffix). The electrolytic capacitor is 100 uF, the feedback capacitors are 33 pF, and the others are 1 uF. The input resistors are 20 kohm, and the feedback resistors are 100 kohm. All are 0805 packages.

A small practice amplifier for guitars based on the LM4950 power amp; specifically designed for a bass guitar. Intended for a single 8-ohm speaker.

Parts list:
C1 - CAP ALUM 220UF 20% 35V RADIAL, DigiKey p/n: P12411-ND
C2, 3, 4 - CAP ALUM 10UF 20% 50V RADIAL, DigiKey p/n: 493-11003-1-ND
C5, 6, 7 - CAP CER 0.22UF 50V 10% RADIAL, DigiKey p/n: 445-8625-ND
C8 - CAP FILM 1UF 10% 250VDC RADIAL, DigiKey p/n: P10979-ND
C9 - CAP ALUM 100UF 20% 16V RADIAL, DigiKey p/n: 493-4638-1-ND
C10 - CAP CER 82PF 50V 5% RADIAL, DigiKey p/n: 445-4725-ND
C11 - CAP FILM 0.39UF 5% 63VDC RADIAL, DigiKey p/n: 495-4846-1-ND
C12 - CAP TANT 1UF 35V 10% RADIAL, DigiKey p/n: 478-4168-ND
C13 - CAP CER 10UF 16V 20% RADIAL, DigiKey p/n: 445-8550-ND
D1, 2 - DIODE SCHOTTKY 100V 1A DO204AL, DigiKey p/n: SB1H100-E3/73GICT-ND
D3 - LED 5MM GREEN CLEAR 527NM 30DEG, DigiKey p/n: C503B-GCN-CY0C0791-ND
J1 - CONN JACK POWER 2.1MM PCB, DigiKey p/n: CP-102A-ND
J2 - CONN PHONE JACK 2COND SGL CLOSED, DigiKey p/n: SC2014-ND
J3 - TERMINAL BLOCK 5.08MM 2POS PCB, DigiKey p/n: ED1643-ND
KNOB - SWITCH KNOB RIBBED .551" PKG, DigiKey p/n: 450-1742-ND
MOV - VARISTOR 24V 250A DISC 7MM, DigiKey p/n: MOV-07D270K-ND
Q1 - MOSFET N-CH 60V 200MA TO-92, DigiKey p/n: 2N7000TACT-ND
R1, 2 - RES 1M OHM 1/4W 1% AXIAL, DigiKey p/n: 1.00MXBK-ND
R3, 4, 5, 6 - RES 2.21K OHM 1/4W 1% AXIAL, DigiKey p/n: 2.21KXBK-ND
R7 - RES 82K OHM 1/4W 1% AXIAL, DigiKey p/n: S85KCACT-ND
R8 - RES 39.2K OHM 1/4W 1% AXIAL, DigiKey p/n: 39.2KXBK-ND
R9, 10, 11 - RES 22K OHM 1/4W 1% AXIAL, DigiKey p/n: S22KCACT-ND
R12 - RES 69.8K OHM 1/4W 1% AXIAL, DigiKey p/n: 69.8KXBK-ND
R13, 14, 15, 16 - RES 100K OHM 1/4W 1% AXIAL, DigiKey p/n: 100KXBK-ND
R17 - POT 10K OHM 1/20W CARBON LINEAR, DigiKey p/n: PTV09A-4225F-B103-ND
SUPPLY - AC/DC WALL MOUNT ADAPTER 12V 12W, DigiKey p/n: 237-1455-ND
U1 - IC OPAMP AUDIO 15MHZ 8DIP, DigiKey p/n: LM833NGOS-ND
U2 - IC REG LDO 10V 0.1A TO92-3, DigiKey p/n: 296-1996-ND
U3 - IC AMP AUDIO PWR 7.5W AB TO263-9, DigiKey p/n: LM4950TSX/NOPBCT-ND

A control board for a small wind turbine based on the LM2596.
Part List:
C1, 2 - 220uF, 50V Cap - Digikey p/n - 565-4067-ND
C3, 4 - 4.7uF, 50V Cap - Digikey p/n - 587-2994-1-ND
C5 - 560uF, 35V Cap - Digikey p/n - UPJ1V561MHD-ND
C6, 16 - 220 pF, 50V Cap - Digikey p/n - 311-1129-1-ND
C7, 8, 9, 10, 11, 12 - 1uF, 50V Cap - Digikey p/n - 1276-1029-1-ND
C13 - 10uF, 16V Cap - Digikey p/n - 1276-1096-1-ND
C18 - 1200pF, 50V Cap - Digikey p/n - 399-8018-1-ND
D1, 2, 3 4, 5, 6, 7, 8 - 2A Schottky - Digikey p/n - 497-8032-1
D10 - 10V Zener - Digikey p/n - BZX79C10-ND
D11 - 36V Zener - Digikey p/n - 1N5258B-TPCT-ND
D12 - 60V 5A Schottky - Digikey p/n - 497-8487-1-ND
F1 - 7A Fuse - Digikey p/n - 507-1566-1-ND
J1 - 3 Pos. Term Blk - Digikey p/n - 277-1248-ND
J2 - 2 Pos. Term Blk - Digikey p/n - ED1643-ND
L1 - 68uH, 3.2A Inductor - Digikey p/n - 732-1247-1-ND
Q1 - 12A Thyristor - Digikey p/n - 568-3674-5-ND
Q2 - NPN Transistor - Digikey p/n - 2N3904FS-ND
Q3 - N-CH MOSFET - Digikey p/n - 568-10997-1-ND
R1, 2, 4, 6, 9, 12 - 33.2K Ohm resistor - Digikey p/n RNCP0805FTD33K2CT-ND
R10 - 0.01 Ohm resistor - Digikey p/n - 989-1021-1-ND
R13 - 100 Ohm resistor - Digikey p/n - P100CCT-ND
R14 - 3.32K Ohm resistor - Digikey p/n RMCF0805FT3K32CT-ND
R15 - 1.74K Ohm resistor - Digikey p/n - 311-1.74KCRCT-ND
S1 - 8 Pos. DIP Socket - Digikey p/n - AE9988-ND
U1 - 5V LDO Regulator - Digikey p/n - 497-2952-ND
U2 - 3A Buck Reg. Adj. - Digikey p/n - LM2596DSADJGOS-ND
U3 - Current Monitor - Digikey p/n - ZXCT1084E5TACT-ND
U4 - 4.00V MPU Reset - Digikey p/n - APX809-40SAGDICT-ND
U5 - 8bit MCU - Digikey p/n - ATTINY85-20PU-ND
U6 - OpAmp - Digikey p/n - LM358AMX/NOPBCT-ND