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ATtiny13A Relay Bypass Quasi-IC

Based on the Matt Garman ATtiny13A Relay Bypass Quasi-IC

Category: Utility· Bypass module
Price: see vendor
Tags: MCU bypass, KiCad, CERN-OHL-P-2.0, through-hole, gerbers

Get the gerbers and KiCad project at Matt Garman Schematic PDF KiCad schematic KiCad project Gerbers BOM (CSV format)BOM (PDF format)Firmware (mcu-bypass-firmware)Firmware image v0.9.18: bypass-attiny13a-tq2_l2_5v_relay.hex Firmware image v0.9.18: bypass-attiny45-tq2_l2_5v_relay.hex Firmware image v0.9.18: bypass-attiny85-tq2_l2_5v_relay.hex Flashing the firmware Discussion: DIYStompBoxes thread Discussion: PedalPCB forum thread Build report: Pez Rojo

From the vendor

A true-bypass version of the quasi-IC: no buffers, a Panasonic TQ2-L2-5V latching relay switched by an ATtiny13A, ATtiny45 or ATtiny85 running the same firmware. Through-hole, so it is larger; its middle nine pins match the ATtiny202 module, and extra pins (9 V after the protection, 5 V, ground, LED) let it drive off-the-shelf boards such as PedalPCB or AionFX.

Fabrication notes from the designer: I used these with JLCPCB; their suitability for other fabricators is unknown. They were generated from the KiCad project via kicad-jlcpcb-tools.

Schematic

The schematic is in Matt Garman's own KiCad project: open the KiCad schematicor its PDF, or get the whole project to modify it.

Parts list 22 rows

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Ref	Value	Normalized	Type	Notes
Resistors 8
CLR1	4k7	4.7k	axial
R13	100R	100	axial
R22	10k	10k	axial
R23	10k	10k	axial
R24	100k	100k	axial
R27	100k	100k	axial
R29	1k	1k	axial
R30	100k	100k	axial
Capacitors 5
C1	22uF	22u	radial electrolytic
C8	10uF	10u	box film
C28	100nF	100n	box film
C29	22nF	22n	box film
C30	470nF	470n	box film
Diodes 3
D1	1N5817	1N5817	DO-35
D2	1N5817	1N5817	DO-35
D3	1N5817	1N5817	DO-35
Transistors 3
Q1	2N7000	2N7000	TO-92
Q2	2N7000	2N7000	TO-92
Q3	2N7000	2N7000	TO-92
ICs 2
U1	LP2950-5.0	LP2950-5.0	TO-92
U9	ATtiny13A	ATTINY13A	DIP-8	DIP-8; ATtiny45 or ATtiny85 also run the firmware
Other 1
K1	TQ2-L2-5V	TQ2-L2-5V	relay	Panasonic latching DPDT relay