10 mm to 1-3/8" Mallory Cap Adapter

This is used to allow Nichicon LGX and LGY series capacitors to be mounted on a board which was originally for Mallory 1" diameter electrolytic caps. In my case this was to repair a Tektronix 7613 oscilloscope mainframe which had bad capacitors on the rectifier board. Note that this particular scope has two physical sizes of capacitors. This is the larger one. The 5 pins which replace the pins from the original capacitor are Harwin, Inc. H2101-01 pins which are digikey 952-1433-ND. Note that this pin is pretty skinny compared to the original Mallory capacitor pin so it will take a little soldering effort on the Tektronix board side.

10 mm to 1" Mallory Cap Adapter.

This is used to allow Nichicon LGX and LGY series capacitors to be mounted on a board which was originally for Mallory 1" diameter electrolytic caps. In my case this was to repair a Tektronix 7613 oscilloscope mainframe which had bad capacitors on the rectifier board. Note that this particular scope has two physical sizes of capacitors. This is the smaller one.

The 5 pins which replace the pins from the original capacitor are Harwin, Inc. H2101-01 pins which are digikey 952-1433-ND. Note that this pin is pretty skinny compared to the original Mallory capacitor pin so it will take a little soldering effort on the Tektronix board side.

PDM Generator

40pin socket used with a SOJ-36 pin SRAM IC to 32 wirewrap pins.

Multi-year LED glow marker

Multi-year LED glow marker

Boost converter for supercapacitor-powered LED

RGB LEDs hearth for Valentines day

https://gitlab.com/trigotoram/RGBLEDhearth.git

[email protected]

telegram - @httri

Simple board students can solder together, program, and take home.

Apple II Raspberry Pi adapter

KiCad files at https://gitlab.com/salfter/A2RPi_v2

A small breakout board for the RFM95W/SX1276 LoRa module.

• Cheap - about 1" x 1".

• Fits standard breadboards.

• Has the option for fitting an SMA antenna on-board by populating R1 with 0R 0603 resistor.

• Includes de-coupling caps on rear - recommend to use C1 0.1uF and C2 10uF 0603s.

• Has silkscreened area on the rear for recording info - such as the frequency of the device.

http://hiddenridge.net/wp/index.php/2018/02/01/i2c-12-bit-binary-counter/ This is version 4 of the board. The board uses 2 each 74LS590 binary counter chips in series. The chips are wired to give a 12 bit count buffered into an MCP23017 I2C GPIO chip. I added address cut traces for the I2C address. It now has two QWIIC connectors as well as a .1-in 4 pin opening for the I2C. The board counts on the low to high transition of the input. It has a power LED and a count LED. The count LED is enabled by a GPIO pin. The GPIO also has a clear function to zero the counters and a GPIO pin for latching the count into the output buffer of the 74LS590 for accurate read by the GPIO. The MCP23017 has two 8 bit GPIO registers The first 12 are dedicated inputs for the binary count. The last three are dedicated outputs for count clear, count buffer latch and to enable the count LED. The final GPIO has a tie point and can be used for a 13th bit to up the total count from 4095 max count to 8191, or it cam be used as a GPIO output.

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Night Light

Opto coupler - 1 port Input adjustable by changing the resistor Capacitor: .1uF Resistor: Varies, for 24V, 470 Ohms Optocoupler: 4N25