A venture in retrotronics

The pt1-OKIT3W32-4V5max is a robust and stable power supply providing four outputs, adjustable from 0.75V to 4.5V, at a maximum of 3A in total. The board is built around a Murata OKI-T/3-W32 DC-DC switching (buck) converter, not requiring a heat sink.

The input voltage can be anywhere between 9V and 32V, supplied through the screw connector or the barrel jack connector.

The module features an on-board fuse, protecting the circuit against sustained input reversal. The power output is protected against short circuits and over temperature. The converter will automatically restart as soon as the short circuit condition is removed.

Some translator logic has been added to the circuit to provide a (positive) logic ENABLE signal (e.g. 3.3/5V).

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s2smodern

The pt1-OKI78SRE-5V-3V3 is a robust and stable power module providing four 3.3V outputs and another four 5.0V outputs, for each of the two voltages at a maximum of 1.5A in total. The board is built around two of Murata's fixed-output DC-DC switching (buck) regulators from the OKI-78SR series, providing a far higher efficiency than any linear power regulator, and thus not requiring any heat sinks.

The input voltage can be anywhere between 7V and 36V, supplied through the screw connector or the barrel jack connector.

Both power circuits feature their own fuse (protecting the circuits against sustained input reversal) and an indicator LED. The power outputs are protected against short circuits and over temperature. The converters will automatically restart as soon as the short circuit condition is removed.

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s2smodern

This is a breakout board for the TI TLC5947 IC, a constant-current LED driver supporting 24 channels, and 12-bit PWM control per channel. Unfortunately this powerful yet easy to drive IC is only available in high-density packages that are hard to solder without special equipment and skill. Even more so considering that the TSSOP package not only features a 0.65mm pitch but also requires an integrated heat sink underneath — this is what TI calls a DAP/PowerPAD Thermally Enhanced package. That means that there is a thermal pad at the bottom side of this HTSSOP package which needs to be connected (i.e. soldered) to a heat sink (i.e. two or more copper planes connected through thermal vias) integrated (i.e. designed) into the PCB.

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s2smodern

The pt1-ATmega1284-5V33V is a robust, fully featured ATmega1284 development board built on through-hole components. Its main feature is a fast-mode I2C interface that supports 5V and 3.3V devices at the same time. Both voltages are provided by two on-board regulators.

Apart from the two main connectors making the full range of MCU pins available, the board also features individual connectors for I2C at 5V and 3.3V, power at 5V and 3.3V, and ISP and UART. The latter two allow the board to be connected to a computer for programming and monitoring/debugging with minimum wiring and hassle. External power can be provided through the 5.5mm power jack, or directly from an external 5V source.

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s2smodern

 

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