Shared Projects by skum

Rev. B here: https://oshpark.com/shared_projects/qyVkkKLJ

A RGB and audio amp for your PC Engine and friends (Core Grafx, Turbo Grafx and whatnot). Mega Drive 2 compatible video plug, RGB SCART cable should have 75Ohm resistors (and preferably also 220uF caps) which the cables should have already. Audio is also amplified a little to get higher volume, as it is a bit low from the expansion port.

• U1 3x23 Pin 2.54mm pitch header. Samtec SSQ-123-02-T-T-RA, SSW-123-02-T-T-RA (or -F-T-RA versions). As such only the left 2x3 pins and the right 3x3 pins are connected, thus any combination of plugs that covers those are adequate. 3xSSW-102-02-T-T-RA should thus also be good, or 2xSSW-103-02-T-T-RA. Note that Samtecs portfolio is huge, and there are many combinations of plugs that will work as long as they have 2.54 mm/0.100" pitch, are triple row and right angle.
• U3 MINI-DIN-9PIN (I used MDC-209 from tme.eu, but MD-90S from Mouser should be just as good)
• C1,C2,C3,C4 0.1uF 0805 MLCC SMD capacitor
• J1 1x02 Pin 2.54mm pitch connector (not necessary if you dont wanna disable the filter)
• R1,R3,R4,R5,R6,R11,R12 10K 0805 SMD resistor
• U2 THS7374 video amp
• C6,C7 2.2uF 0805 MLCC SMD capacitor
• C10,C11 1uF 0805 MLCC SMD capacitor
• R7,R8 1M 0805 SMD resistor
• R9,R10 2K7 0805 SMD resistor
• U4 TS922A opamp SOIC-8
• C5 10uF 0805 MLCC SMD capacitor
• C8,C9 10nF Film capacitor THT L7.2mm, W2.5mm, P5.00mm
• C12,C13 10uF electrolytic SMD capacitor 5x5.3
• R2 75R 0805 SMD resistor

Capacitors should be rated for 16V or higher (lower should also work, no voltages should exceed the 5V).

I recommend to 3D print one of these brackets to provide a mechanical stabilization of the card when used in PC Engine or Core Grafx: https://www.thingiverse.com/thing:3245238 I don’t have a TG16 to measure the port and make a similar for that.

Idea taken from this thread but since I sometimes needed to switch two frequencies, I made this. Example where it is usable, is when a PSX/PS1/PSone switches between NTSC and PAL, it needs to switch both the carrier frequency of the video signal AND the clock frequency to the GPU/DAC to have a proper video signal, that doesn’t go black and white and so on. This version is functionally identical to initial revision, but 4,3mm more narrow.

Parts list

• U1 1.8V LDO Regulator, here a TPS78218 (Mouser P/N: 595-TPS78218DDCT)
• U2 Texas Instruments CDCE925 (Mouser P/N: 595-CDCE925PWR)
• C1 1uF 0603 SMD capacitor
• C2 1uF 0603 SMD capacitor
• C3 1uF 0603 SMD capacitor
• C4 1uF 0603 SMD capacitor
• R1 10K 0603 SMD resistor
• R2 10K 0603 SMD resistor
• R3 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• R4 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• Y1 27MHz crystal (Mouser P/N: 774-ATS270BSM-1E or the shallower 815-ABLS3-27MD4YFT)

Use 0.8 mm substrate for the most shallow profile.

Note that Y2 and Y4 are parallel coupled, same with Y3 and Y5. Thus if programming with TI’s ClockPro software, Y4 must be tri-stated when Y2 output is on, and Y5 should be tri-stated when Y3 is on. Of course also vice-versa.

More info here

A revision B that is physically smaller, but functionally identical here

Idea taken from https://nfggames.com/forum2/index.php?topic=5744.0 but since I sometimes needed to switch two frequencies, I made this. Example where it is usable, is when a PSX switches between NTSC and PAL, it needs to switch both the carrier frequency of the video signal AND the clock frequency to the DAC to have a proper video signal that doesn’t go black and white and so on.

Parts list:

• U1 1.8V LDO Regulator, here a TPS78218 (Mouser P/N: 595-TPS78218DDCT)
• U2 Texas Instruments CDCE925 (Mouser P/N: 595-CDCE925PWR)
• C1 1uF 0603 SMD capacitor
• C2 1uF 0603 SMD capacitor
• C3 1uF 0603 SMD capacitor
• C4 1uF 0603 SMD capacitor
• R1 10K 0603 SMD resistor
• R2 10K 0603 SMD resistor
• R3 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• R4 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• Y1 27MHz crystal ((Mouser P/N: 774-ATS270BSM-1E or the shallower 815-ABLS3-27MD4YFT)

Use 0.8mm substrate for a shallow profile.

Note that Y2 and Y4 are parallel coupled, same with Y3 and Y5. Thus if programming with TI’s ClockPro software, Y4 must be tri-stated when Y2 output is on, and Y5 should be tri-stated when Y3 is on. Of course also vice-versa.

More info here

Clone of the JVC IF-C01COMG RGB/YPbPr input board for JVCs professional video monitors (PVMs) like the TM-H1950CG. This is the through-hole version, opposed to the SMD version also available, so it is easier to solder by hand.

The optional components have been removed to save space.

The diodes (except D201) should be BAT46-TR and the transistors BC550 (or alike). For D201 I used a 1N5242BTR (Mouser P/N: 610-1N5242BTR). The FPC/FFC connector should be a HLW14R-2C7LF or SLW14R-1C7LF depending on which FPC/FFC cable is used (same-side contacts or opposite side contacts), I used the HLW14R-2C7LF. If the FPC stuff is not used, there are designators to which pad does what on the bottom, so wires can be soldered directly to the board from SCART, BNC, RCA or whatever.

Power regulator should be a LM2940 12V in TO-220 house.

For now resistor and capacitor values can be found on the SMD version here, where there’s also links to compatible input boards: https://oshpark.com/shared_projects/hMJMT0yM

Resistors should be 6.3mm long, ceramic capacitors have a lead spacing of 2.5mm. Example resistors:

• 100R, Mouser P/N: 603-MFR-25FBF52-100R
• 33K, Mouser P/N: 603-MFR-25FRF52-33K

Example ceramic capacitors:

• 180pF, Mouser P/N: 810-FA18C0G1H18100
• 39pF, Mouser P/N: 810-FG18C0G1H390JNT0
• 100nF, Mouser P/N: 594-K104K15X7RF53L2

KiCad project here: https://github.com/skumlos/if-c01comg-clone-tht

A BNC input board for the IF-C01COMG Clone also present here.

This is rev. B with proper stereo-to-mono circuit.

I have NOT tried it out myself yet…

Parts list:

• J1, Molex 52852-1472 (Mouser P/N: 538-52852-1472)
• GY1, Molex 73171-1900 (Mouser P/N: 538-73171-1900)
• B-BY1, Molex 73171-1900
• R-RY1, Molex 73171-1900
• HD-CS1, Molex 73171-1900
• VD, Molex 73171-1900
• L1, RCJ-023 (Mouser P/N: 490-RCJ-023)
• R1, RCJ-022 (Mouser P/N: 490-RCJ-022) (Yeah I know the reference naming is stupid now…)
• R2, 20K 1% 0805 Resistor
• R3, 475R 1% 0805 Resistor
• R4, 475R 1% 0805 Resistor
• Connect the two boards with a Molex 15267-0300 FPC cable (Mouser P/N: 538-15267-0300)

Base board here: https://www.oshpark.com/shared_projects/hMJMT0yM