Shared Projects

A wearable platform built on a nato watch strap with a attiny85 and powered by a CR2032 coin cell. I used a tilt sensor as a button that turns each LED on in turn.

Blog post - https://wp.me/pKY3w-o1 Github - https://github.com/facelessloser/attiny85_wearable_concept Youtube - https://www.youtube.com/watch?v=YOjYC2ICE18

https://www.f5uii.net/mmdvm-nucleo-stm32-pcb-shield/

Very Simple Musical Interrupter for driving dual Tesla Coils in stereo from Direct Audio. This is a custom variation of the original Dual VSMI 2.0 by Grégory Gusberti and Fabrício Franzoli as found on Alex Yuan’s website: http://www.personal.psu.edu/ahy5028/coiling/Schematics/Dual_VSMI.jpg. I built it to see how it compares with my other attempts at making a decent direct audio interrupter for Tesla Coils.

All ICs are TSSOP packages. All resistors and capacitors are 0805 footprint, with the exception of C6, C12, C13, C15, and C17, which are 1206. The LEDs are 1206 package. All thru-hole components (i.e. the connectors and potentiometers), plus the two LEDs, mount on the bottom side, which is designed to be the “top” in the final assembly.

To the original design, this version adds a headphone/speaker monitor output and fiber optic transmitters for driving a Tesla Coil control board. Reference designators have been kept in sync with the original schematic referenced above.

Errata: The 10K “Sensitivity” potentiometers, RV1 and RV3, operate backwards – turning them CCW increases sensitivity and turning them CW decreases sensitivity. Additionally, the Sensitivity potentiometers really do little to nothing at all, as the only time it will detect the incoming signal is if you crank the volume on your device to max and turn this circuit to maximum sensitivity. This seems to be a design flaw in the original circuit. So you might as well skip the Sensitivity controls and tie them directly to ground or do a fixed-resistor divider network like their other circuit variation at http://www.personal.psu.edu/ahy5028/coiling/Schematics/VSMI_REVB.jpg.

Also, the high-impedance DC-coupled pull-up on the inputs causes some phone/player type devices that use the bias/loading on their headphone jacks to detect connection/disconnection, to incorrectly think you have unplugged the cable from the jack. In other words, it can’t detect that this device is plugged in. My Android Samsung player device behaved that way.

Otherwise, it does function. The quality of the chopped audio, though, isn’t nearly as good as I had hoped. It’s comparable to several other attempts at a direct audio interrupter.

Collection of eight discrete narrow-band leds from 400 - 940 nm for testing and calibration of the AS7265X 18-channel spectrometer. Intended to be powered by a LiPo battery and use simple shunts to connect sink to GND for actuation. Can also be used on the breadboard with current sinking circuits, if desired.

dual-PMOD interface to 64Mbit S27KL0641DABHI020 HyperRAM ( DRAM w/ built in Refresh Controller ).

A board for driving an OLED & air-core motor for diy instruments.

Internal resistance meter. V1.2 fixes missing sense connection and cuts the programming castellations deeper.

RGB/YPbPr input card for JVC professional monitors like TM-H1950CG. Based on the original card, thus all resistors and capacitors have same reference ID as the original card. Only the power supply part is different. This is the base board, which supplies the actual “interface” electronics. You then need one of the input boards mentioned in the bottom of this post, OR solder directly to the pads on this board. If you’re not into SMD’s there’s a through-hole version here: https://www.oshpark.com/shared_projects/NHivAGjf

Scroll down for parts list

Assembled board (without VD section)

Parts list:

• C101, 47uF/25V Electrolytic capacitor 6.3x5.7 (Mouser P/N: 710-865080443007)
• C102, 47uF/25V Electrolytic capacitor 6.3x5.7
• C103, 47uF/25V Electrolytic capacitor 6.3x5.7
• C104, 10uF/50V Electrolytic capacitor 5.0x5.7 (Mouser P/N: 710-865080642006)
• C105, 10uF/50V Electrolytic capacitor 5.0x5.7
• C120, 10uF/25V Electrolytic capacitor 5.0x5.7
• C122, 10uF/25V Electrolytic capacitor 5.0x5.7
• C115, 100uF/16V Electrolytic capacitor 6.3x5.7 (Mouser P/N: 710-865080343009)
• C207, 100uF/16V Electrolytic capacitor 6.3x5.7
• C203, 1uF/50V Electrolytic capacitor 4x5.7 (Mouser P/N: 710-865080640001)
• C114, 100nF 0805 MLCC (Mouser P/N: 710-885012207072)
• C116, 100nF 0805 MLCC
• C117, 100nF 0805 MLCC
• C118, 100nF 0805 MLCC
• C119, 100nF 0805 MLCC
• C206, 100nF 0805 MLCC
• C121, 1uF or above 0805 MLCC (I used 10uF)
• C201, 180pF 0805 MLCC (Mouser P/N: 603-CC805JRNPO9BN181)
• C202, 180pF 0805 MLCC
• C205, 180pF 0805 MLCC
• C204, 39pF 0805 MLCC (Mouser P/N: 77-VJ0805A390JXAAC)
• J1, Molex FPC 52852-1472 (1.0 mm pitch) (Mouser P/N: 538-52852-1472)
• J2, 50P 2x25 2.54 mm pitch connector (Example is Mouser P/N: 517-30350-5002, original is a Hirose PCN10A-50P)
• D101, Diode SOD-123 (All diodes except D201 are the same, I used Mouser P/N: BAT46W-E3-18)
• D102, Diode SOD-123
• D103, Diode SOD-123
• D104, Diode SOD-123
• D105, Diode SOD-123
• D106, Diode SOD-123
• D107, Diode SOD-123
• D108, Diode SOD-123
• D109, Diode SOD-123
• D110, Diode SOD-123
• D201, Zener Diode SOD-123 (Mouser P/N: 78-BZT52C12-E3-08)
• Q101, Transistor SOT-23, BC850 or alike (Mouser P/N: 512-BC850AMTF)
• Q105, Transistor SOT-23, BC850 or alike
• Q109, Transistor SOT-23, BC850 or alike
• Q113, Transistor SOT-23, BC850 or alike
• Q114, Transistor SOT-23, BC850 or alike
• Q201, Transistor SOT-23, BC850 or alike
• R101, 75R 0805 1% Resistor (Mouser P/N: 603-RC0805FR-0775RL)
• R115, 75R 0805 1% Resistor
• R129, 75R 0805 1% Resistor
• R143, 75R 0805 1% Resistor
• R152, 75R 0805 1% Resistor
• R104, 100R 0805 1% Resistor (Mouser P/N: 603-RC0805FR-13100RL)
• R114, 100R 0805 1% Resistor
• R118, 100R 0805 1% Resistor
• R128, 100R 0805 1% Resistor
• R132, 100R 0805 1% Resistor
• R142, 100R 0805 1% Resistor
• R146, 100R 0805 1% Resistor
• R155, 100R 0805 1% Resistor
• R105, 56K 0805 1% Resistor (Mouser P/N: 603-RC0805FR-1356KL)
• R119, 56K 0805 1% Resistor
• R133, 56K 0805 1% Resistor
• R203, 56K 0805 1% Resistor
• R106, 33K 0805 1% Resistor (Mouser P/N: 603-RC0805FR-1333KL)
• R120, 33K 0805 1% Resistor
• R134, 33K 0805 1% Resistor
• R147, 33K 0805 1% Resistor
• R148, 33K 0805 1% Resistor
• R156, 33K 0805 1% Resistor
• R157, 33K 0805 1% Resistor
• R107, 1.5K 0805 1% Resistor (Mouser P/N: 603-RC0805FR-071K5L)
• R121, 1.5K 0805 1% Resistor
• R135, 1.5K 0805 1% Resistor
• R113, 390R 0805 1% Resistor (Mouser P/N: 603-AC0805FR-07390RL)
• R127, 390R 0805 1% Resistor
• R141, 390R 0805 1% Resistor
• R149, 2.7K 0805 1% Resistor (Mouser P/N: 603-RC0805FR-072K7L)
• R158, 2.7K 0805 1% Resistor
• R205, 2.7K 0805 1% Resistor
• R150, 0R 0805 1% Resistor
• R159, 0R 0805 1% Resistor
• R202, 1K 0805 1% Resistor (Mouser P/N: 603-AC0805FR-071KL)
• R204, 68K 0805 1% Resistor (Mouser P/N: 603-RC0805FR-0768KL)
• U1, NCP1117-12 SOT-223 (Mouser P/N: 863-NCP1117ST12T3G)

Optional components, these are not mounted on the original board, but I made pads if someone finds it appropriate to use them:

• C106, Optional 0805 MLCC
• C106, Optional 0805 MLCC
• C108, Optional 0805 MLCC
• C110, Optional 0805 MLCC
• C112, Optional 0805 MLCC
• C113, Optional 0805 MLCC
• R151, Optional 0805 Resistor
• R160, Optional 0805 Resistor

If you’re not going to use devices with separate horizontal and vertical sync, you can skip the whole VD section.

RGB SCART input board here: https://www.oshpark.com/shared_projects/AJ7xHRxi

Untested BNC input board here: https://www.oshpark.com/shared_projects/GYx5pdjH

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

ICRS: IR Receiver v0

ICRS: Localization Module v0

ICRS: Motor Module v0

ICRS: Power Module v0

ICRS: Servo Module v0

ICRS: Ultrasonic Sensor v0

Test transmitter for LAD

1.6 GHz Right-hand Circularly Polarised Quadrifilar Helix Antenna.

Deisgned for use with Inmarsat L-Band downlinks.

BOM:
- SMA Connector
- 1.2mm Copper Wire

Element calculator
- Frequency: 1545 MHz
- Bend radius: 2mm
- Conductor diameter: 1.2mm
- Width/height ratio: 0.5
- All other settings default

This board is experimental!

Design by sam210723.

This allows the Amiga 500 to map different drives to different select lines enabling the booting of an external drive.

https://github.com/maxritter/DIY-Thermocam GNU General Public License v3.0

I.A.T.S.

It’s A Tube Screamer