C64-Modulator-Replacement

tebl·C64-Modulator-Replacement

C64-Modulator-Replacement PCB layout, top view — open source board by tebl

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About the C64-Modulator-Replacement PCB

C64-Modulator-Replacement is an open source PCB design by tebl, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 63.5 × 63.4 mm, with 40 components from 27 distinct parts.

Other key parts include the LM7805. By type, the board carries 13 connectors, 10 resistors, 7 capacitors, 3 jumpers, 2 transistors and 2 diodes.

It belongs with the retro computing and audio designs in this gallery.

From the project

A simple modulator replacement for Commodore 64s with "longboards", complements my Lumafix version as well adding an audio connector for second SID.

Based on the C64 RF-modulator mod by Zero-X / OMS, this adapts those schematics to create a complete replacement for the original modulator including a few changes of my own. A nice writeup and the my original inspiration for making this version if it came from a blog post on My Diy Blog (not actually my blog, it's just called that).

The modulator replacement replaces the original circuit, with the original responsible for boosting the output from the VIC-chip and generating composite video, S-Video and the RF-signal. The replacement removes the old RF-signal output as well as the noise it…

C64-Modulator-Replacement, from the project README — From the project README

Main components on the C64-Modulator-Replacement

C64-Modulator-Replacement bill of materials (BOM)

40 components, 27 distinct parts.

Qty	Part	Footprint	Refs
1	LM7805	TO-220-3_Horizontal	U1
2	BC549	TO-92_Inline_Wide	Q1, Q2
1	8765	Pin_Header_Straight_1x04_Pitch2.54mm	J2
1	4321	Pin_Header_Straight_1x04_Pitch2.54mm	J3
1	AUD_RIGHT	Pin_Header_Straight_1x02_Pitch2.54mm	J4
1	TRS_3.5mm	Tayda_3.5mm_stereo_TRS_jack_A-853	J5
1	RCA_PLUG	rca_yellow	J6
8	—	anchor_circle	J7, J8, J9, J10, J11, J12, J13, J14
1	AUD_MONO	Pin_Header_Straight_1x03_Pitch2.54mm	JP2
1	CHR	Pin_Header_Straight_1x02_Pitch2.54mm	JP3
1	LUM	Pin_Header_Straight_1x02_Pitch2.54mm	JP4
2	1n4148	D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2
1	22uH	L_Axial_L6.6mm_D2.7mm_P10.16mm_Horizontal_Vishay_IM-2	L1
1	10uH	L_Axial_L6.6mm_D2.7mm_P10.16mm_Horizontal_Vishay_IM-2	L2
2	330pF	C_Disc_D4.7mm_W2.5mm_P5.00mm	C1, C3
1	150pF	C_Disc_D4.7mm_W2.5mm_P5.00mm	C2
1	10uF	CP_Radial_D5.0mm_P2.50mm	C4
1	100uF	CP_Radial_D5.0mm_P2.50mm	C5
1	68pF	C_Disc_D4.7mm_W2.5mm_P5.00mm	C6
1	100nF	C_Disc_D4.7mm_W2.5mm_P5.00mm	C7

Show 7 more

Qty	Part	Footprint	Refs
1	1k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1
1	3k3	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R2
1	5k6	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3
1	68	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R4
1	220	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R5
1	470	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R6
4	150	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R7, R8, R11, R12

C64-Modulator-Replacement design files

The KiCad project lives in the tebl/C64-Modulator-Replacement repository on GitHub; these links point at the commit this page was built from.

LayoutC64 Modulator.kicad_pcb

C64-Modulator-Replacement: common questions

How big is the C64-Modulator-Replacement PCB?

The C64-Modulator-Replacement measures 63.5 × 63.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the C64-Modulator-Replacement?

40 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the C64-Modulator-Replacement design files?

From the tebl/C64-Modulator-Replacement repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the C64-Modulator-Replacement design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which tebl chose for the repository.

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