See https://github.com/pepaslabs/opamp-vos

A 4 Way antenna switch with bias-T power to LNA at broadband antenna. Each of the 4 RF outputs has provision for an LTCC filter to allow targeting of individual bands of interest.
B.O.M.:
1. 1 X ADG904 or ADG904-R TTSOP-20
2. 4 x PESD5V0X1BT SOD323
3. 1 x AMS1117-5V0 SOT223
4. 1 x AMS1117-1V8 SOT223
5. 2 x 47K Resistors 1206
6. 1 x 1K Resistor 1206
7. 1 x 3mm LED
8. 3 x 100p Capacitor 1206
9. 3 x 100n Capacitor 1206
10. 1 x 1n Capacitor 1206
11. 5 x SMA Female PCB edge Connectors
12. 1 x 4 way dual rotary switch

Tested and fully functional.

Parts list: C1, C2: 0.1uF R1, R5: 1K Ohm R2, R3: 330 Ohm R4: 100 Ohm MCU: ATMega8L-8AU GRN: Green LED RED: Red LED

All passives are 0805. ISP header for Pogo-pin programming.

See https://hackaday.io/project/78326-upower-beehive-sd-logger for files/details.

V1.2.1 has the MCP1700/1703 SOT-223 footprint corrected and a few texts removed.

footprint fix

Rev C Display Board for the Water Leak detector. See RV-Project.Com for details.

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

Tiny85 Pro Mini v1.0

$0.70 each ($2.10 for 3)

https://bitbucket.org/serisman/pcb-tiny85-pro-mini

ARDUINO COMPATIBLE - TO DO… more information about Arduino IDE configuration

This uses the same serial port pinout as the Arduino Pro Mini. The software serial port is accomplished with a half-duplex RxTx pin on PB5 along with accompanying hardware to emulate separate RX/TX pins. To use this, you will need to modify the fuses to turn off Reset AFTER burning the TSB bootloader. This arrangement keeps all of the normal pins PB0-PB4 available for project use.

This board also uses an alternate method of performing reset (auto-reset supported) by using a mosfet to disconnect GND when the Reset line is low.

Suggested Fuses:

• for 5V 16MHz operation: Low=0xF1, High=0xDC (0x5C after burning bootloader), Ext=0xFE
• for 3.3V 8MHz operation: Low=0xE2, High=0xDD (0x5D after burning bootloader), Ext=0xFE

Suggested BOM:

• U1: SOIC-8 (wide!) - ATtiny85
• U2: SOT-23 - XC6206 (662k) 3.3v LDO regulator (6V max input), or 78L05 (L05) 5v regulator
• Q1: SOT-23 - Si2302DS N-Channel low RDS_ON mosfet
• Q2: SOT-23 - 2N7002 N-Channel mosfet
• D1: SOD-323 - 1N4148WS diode
• C1,C2: 0805 - 100nF capacitors
• C4,C5: 0805 - 1uF capacitors
• C3,C6: 0805 - 10uF capacitors
• R1: 0805 - 10k resistor
• R2: 0805 - 4.7k resistor
• SW1: - Momentary push button switch for Reset

Rev A Sensor paddle board for LD-1 (Water LeakDetector Board). See www.RV-Project.Com for details.

Rev B. Adapted from the H2OhNo! design.

See www.rv-project.com for details.

Simple Power Management Board Including: 1) Constant Current LED Driver 2) Isolated DC-DC converted 3) Lithium battery adapter

Small breakout for MS5837 pressure sensor.

An AVR programmer/tool based on the ATmega32u4. It includes many breakouts for many different functions, including ISP and UART, as well as selectable target power voltage.

BOM:

• R1: 10k ohm 0805
• R2,R3: 22 ohm 0805
• R4,R5,R6,R7,R8: 2.2K ohm 0805
• C1,C4,C5: 10uF 0805
• C2,C3: 0.1uF 0805
• D1,D5: Red LED 0805 (Marked “Error” and “!” on the board)
• D2: Blue LED 0805 (Marked “Power”)
• D3: Yellow LED 0805 (Marked “Prog”)
• D4: Green LED 0805 (Marked “Ready”)
• U1: ATMEGA32U4-AU (TQFP)
• IC1: MIC5225-3.3 SOT-23
• Y1: 16 Mhz Murata resonator
• SW4: EVQQ2 switch
• J1: USB_A Molex 48037-0001

All other connectors are 2.54 pitch male pin headers. Jumpers J7, J8, J9 and J10 require pin jumpers like: http://a.co/bSmXWlI to bridge at least two pins for operation.

NB: The USB-A connector footprint is backwards on this design! If you want to assemble this board, you can mitigate this by mounting the connector to the back of the board instead of the front. Otherwise I believe this board works.

DMX to Neopixel board. Voltage Isolated DMX interface with separate Arduino Nano CPU’s for DMX and Neopixel driver

BOM, Arduino code and designs at https://github.com/gavinsilver/DMXHATV2

First board built and working!