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Could be done with a capacitor / resistor pair, see Fireball's hard sync to schematic, laid out PCB with on-board components Added hard sync to schematic, laid out PCB with on-board components PCB initial layout, no traces "other_line_width": 0.15, PCB initial layout, no traces "silk_text_size_h": 1.0, "silk_text_size_v": 1.0, PCB initial layout, no traces PCB initial layout, no traces }, Add ground fills, fix some clearance issues, make all power traces large Added input resistor for sync; placed everything on PCB Fireball/Fireball.kicad_sch | 4 Fireball/Fireball_panel.kicad_dru | 102 Fireball/Fireball_panel.kicad_prl | 2 | 1nF | Film capacitor | | | J1 | 1 nF | Unpolarized capacitor | Tayda | A-553 | | | | | | Tayda | A-001 | | S1 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch ON-ON | | | Tayda | A-1135 | | | | | | ----- | --- | ---- | ----------- | ---- | ---- | ---- | ---- | ---- | | C6, C7, C8, C9 Schottky Barrier Rectifier Diode, DO-41 Standard switching diode, DO-35 2x5 pin shrouded header 2.54 mm spacing KK254 Molex connector 2 pin Molex connector 2.54 mm spacing R23, R24, R25, R27 | 4 | 100k | Resistor | | | | S1 | 1 | SW_SPDT | SPDT miniature toggle switch | | | R5 | 2 | 10R | Resistor | | | | | | Screws and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x4 | | | | | | | Tayda | A-4755 | | | | | | | | C1 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)"/> Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Dual Operational Amplifiers, DIP-14/SOIC-14 | | Taydaa | A-4755 | | | | R14, R15, R18 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS) | | C2 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS *(optional) SIP.

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