Frederic LSchematic
Here is the schematic of the controller highlighting the three main parts : regulator, microcontroller and relay.
Bill of Materials
| Part number | Manufacturer | Description | Q | |
| U1 | ATTINY85-20SU | Microchip | 8-bit Microcontrollers - MCU AVR 8K FLSH 512B EE 512B SRAM ADC 5V | 1 |
| IC1 | LM2931DT-5.0G | ON Semiconductor | LDO Voltage Regulators 5V 100mA w/Load Dump | 1 |
| RL1 | V23076A1001C133 | TE Connectivity | Automotive Relays Power Relay K | 1 |
| T1 | BC846BLT1G | ON Semiconductor | Bipolar Transistors - BJT 100mA 80V NPN | 1 |
| OK1 | SFH6186-3T | Vishay | Transistor Output Optocouplers Phototransistor Out Single CTR 100-200>#/td### | 1 |
| FB1, FB2 | FBMJ2125HS420-T | Taiyo Yuden | Ferrite Beads HI CUR CHIP BD 0805 42OHMS 25>#/td### | 2 |
| D1, D2 | CGRTS4007-HF | Comchip Technology | Rectifiers SMD 1000V 1A | 2 |
| D3 | SZMMSZ33ET1G | ON Semiconductor | Zener Diodes REG 0.5W 33V SPCL | 1 |
| C1 | C0603C473K3RACTU | KEMET | Multilayer Ceramic Capacitors MLCC - SMD/SMT 25V 0.047uF 0603 X7R 10>#/td### | 1 |
| C2 | CGA4J1X7S1E106K125AC | TDK | Multilayer Ceramic Capacitors MLCC - SMD/SMT 0805 25VDC 10uF 10% AEC-Q200 | 1 |
| C3 | GRM21BC71C106KE11L | Murata | Multilayer Ceramic Capacitors MLCC - SMD/SMT 0805 10uF 16volts X7S 10>#/td### | 1 |
| C4 | 35ZLH100MEFC6.3X11 | Rubycon | Aluminium Electrolytic Capacitors - Radial Leaded LOW IMPEDANCE ELECTROLYTIC CAPACITORS | 1 |
| C5, C6 | C0603C104K3RAC3190 | KEMET | Multilayer Ceramic Capacitors MLCC - SMD/SMT 25V 0.1uF X7R 0603 | 2 |
| R1 | CRGP2512F470R | TE Connectivity | Thick Film Resistors - SMD CRGP 2512 470R 1% SMD Resistor | 1 |
| R2, R3 | ERJ-3EKF1002V | Panasonic | Thick Film Resistors - SMD 0603 10Kohms 1% AEC-Q200 | 2 |
| R4 | ERJ-3EKF1001V | Panasonic | Thick Film Resistors - SMD 0603 1Kohms 1% AEC-Q200 | 1 |
| J1-J4 | 7799 | Keystone Electronics | Terminals M4 Screw term- H.D. | 4 |
| J5 | 10129381-906004BLF | FCI / Amphenol | Headers & Wire Housings ECONOSTIK HEADER DR VT TH 2X3 | 1 |
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