Project files: Mains DC blocker/filter…
April 10, 2022 Leave a comment
Here are the project files for the DC trap I showed in the last post.
DIY electronics and audio projects – at a snail's pace!
April 10, 2022 Leave a comment
Here are the project files for the DC trap I showed in the last post.
September 18, 2021 4 Comments
In response to a request from a reader for these files. Not sure why they never never published, but they work well and seem fine so here you are š
April 15, 2021 10 Comments
Here is yet another version of a couple of PSUs based on the Mean Well IRM modules. Iāve done these before and the post title basically comes from having simply turned the module 90 degrees to make a more compact footprint ā I know, not exactly a revolutionā¦ š
September 10, 2019 36 Comments
As promised a while ago, here are my designs for the āfilteredā power supplies based on IRM AC/DC modules. These are excellent for adding compact and powerful single and dual supplies which still have a reasonably good performance to any small preamp/headamp amplifier.
October 24, 2017 20 Comments
What is it?
Itās the project files for the PassHP headphone amplifier from last weekās post and judging by the number of views since then they are eagerly awaited š
As mentioned last time, this design is a clone of the one from here and my version consists of a mono amplifier board and a stereo PSU board instead of the original āall-in-oneā design.
How big are the boards?
The amplifier boards measure 2.95ā x 3.0ā (app. 75 x 76 mm.) and the PSU board measures 2.0ā x 5.05ā (app. 51 x 128 mm.).
What is the status of the boards?
Both boards are in version 1.0 as the prototype seems to work well and I couldnāt be bothered to make any cosmetic changes š
Does it use any special/expensive/hard-to-find parts?
Well, the recommended 2SJ313/2SK2013 output transistors are a bit hard to find, but there are plenty of substitutes available. This is a fairly simple design, so otherwise no problems.
Anything else I need to know?
Downloads:
Download design files here
Related information:
You really should chew your way through the diyaudio-thread for information about the amplifier. As mentioned this version was mostly because I did not like the original form factor. If you just want a functioning amplifier then I strongly recommend that you buy one of the ārealā boards from Wayne Colburn via DIYaudio (or wait a few weeks for when the boards show up in the diyaudio store).
Note: Always read the “intro post” for additional important information about my designs.
July 24, 2017 Leave a comment
What is it?
As mentioned a few weeks agoĀ Iāve recently built another control board for switching a mains transformer with a low-voltage (latching) switch. This in a slightly different form factor so that if your application requires it, the board can be stacked with a matching standby-PSU and mains splitter and/or my passive softstart board. It is possible (just) to stack all three boards on top of each other in a 2U/80mm high enclosure or just two boards in a 50mm tall enclosure.
You can decide which standby voltage should be used by choosing the right relay in resistor values and in addition to using a latching switch for engaging the relay, you can also use a DC-voltage between app. 3-30V as the trigger. This input is isolated via an optocoupler and the trigger circuit only requires app. 15mA from the triggering device.
The matching standby PSU board uses the (by now) well-known IRM AC-DC power modules from Mean Well. There are two versions, one for the 3W module which is 100% outline-compatible with the control board and a version for the 5-10W modules where some of the connectors had to be shifted but the mounting holes still fit. The PSU board also provides a splitter-function to give two mains outputs.
How big are the boards?
All the boards are 2ā x 2ā (app. 51 x 51 mm) – the original theslowdiyer industry standard ™ š
What is the status of the boards?
These boards are v1.0 and they all work as expected.
Does it use any special/expensive/hard-to-find parts?
No.
Anything else I need to know?
Downloads:
Download design files here
Related information:
Note: Always read the “intro post” for additional important information about my designs.
Remember that these boards use mains voltage. Be careful when mounting and handling them!
May 27, 2017 6 Comments
What is it?
Board files for my INA217-based microphone preamp and the matching PSU as shown here. The design is meant to be āconfigurableā with three different gain options and phantom power selectable via jumpers. The amp also has a full complement of protection features. The matching PSU has three rails via two small onboard transformers for a compact āall-in-oneā solution.
How big are the boards?
The amp board measures 3.1ā x 1.9ā (app. 79 x 48 mm.) and the PSU board measures 3.95ā x 2.7ā (app. 100 x 69 mm).
What is the status of the boards?
The amp board is version 2.1. Version 2.0 was my update of the original design as showcased in the previous blog post and 2.1 adds a few minor tweaks including an LED to indicate directly on the amp board if phantom power is on or off.
The PSU board is version 2.1 as well for much the same reasons (although the v2.1 ātweaksā consisted mostly of fixing a couple of fairly serious mistakes in component labelling š )
Does it use any special/expensive/hard-to-find parts?
Not really hard-to-find as such, but still worthy of some attention š
Anything else I need to know?
Downloads:
Download design files here
EDIT 20th July 2019: Not sure why the BoM for this project did not make it into the download file, but here it is š
Related information:
Note: Always read the “intro post” for additional important information about my designs.
Before you start I strongly suggest you read through the INA217 datasheet. Please also refer to the aforementioned paper from THAT on this type of microphone preamps, this THAT design note and the datasheet for the THAT1510/THAT1512 ICs.
April 18, 2017 14 Comments
What is it?
The board for my āSTEPS-cloneā single-rail linear PSU as described here. This PSU is suitable for low-power streamers, DACs, headphone amps etc. that run on a single DC-voltage rail and require less than app. 15W maximum. This isnāt really a 100% clone of the original STEPS supply (see here), but Iāve drawn quite a bit of inspiration from the STEPS so I think the credit is well-deserved anyway š
Note that the transformer primary connections are hardwired on the board, so there are separate 115V and a 230V versions of the board files.
How big are the boards?
The board measures 3.95ā x 4.7ā (app. 100 x 119 mm)
What is the status of the boards?
The published board files are for version 1.0 which is the version I have prototyped. There are a few minor changes I could do, but itās mostly cosmetic and it might be a while before I get to it anyway so I have decided to publish this version.
EDIT 21st March 2020: As described here I have added files for v1.5 below. Apart from some other minor changes, the board now includes the footprint for the 10VA Talema transformer (so you can use 10-25VA sizes) as well as an extra set of pads between the main capacitors to make space for a larger footprint inductor for the Pi-filter.
Does it use any special/expensive/hard-to-find parts?
If you can order from Mouser, then nothing here is hard-to find. If you canāt, then the only thing that might be difficult to substitute is the Murata common-mode choke and that is optional anyway š
Anything else I need to know?
Downloads:
Download design files here
EDIT 21st March 2020: Download v1.5 files here
Related information:
1)Ā Read the original STEPS page linked above. Even if the circuit isnāt completely the same, there is still lots of great info about the LM317 type regulators and how to get the most of them.
2)Ā Read the manufacturers datasheet for the regulator that you are working with. Pay specific attention to recommendations around output capacitance and bypassing of the adjust pin as there are some differences between regulator models and manufacturers here.
Note: Always read the “intro post” for additional important information about my designs.
February 15, 2017 5 Comments
What is it?
Since I first discovered the IRM-series of compact switching supplies from Mean Well Iāve grown quite fond of them. They are compact, cheap and very easy to implement so they are perfect for everywhere an āaux-voltageā is required toĀ power non-critical circuitry.Ā Through the different applications Iāve found for these I have managed to build up a full series of boards suitable for the IRMs.
While some of the boards can be (and are intended to be) used for āseriousā stuff (to be shown later on), a very obvious application for most of these boards are as AUX-supplies for powering relays, displays, logic circuitry etc. where a bit more or a bit less ripple and noise are of no consequence, but where the compact size and low standby consumption is a real plus.
There are four board versions, suitable for the IRM modules in all versions from 3-30W output power (the 30W board is missing from the pictures as I couldn’t find the prototype when they were takenĀ – sorry! š ).
How big are the boards?
What is the status of the boards?
All of the board files are version 1.0 or higher. Some tweaks have been done after the initial protoypes for a few of them, mostly because of errors/issues with the IRM module footprints.
Does it use any special/expensive/hard-to-find parts?
No, none. Several places to get the IRM-modules them selves (Mouser, Reichelt, TME etc.) and everything else on the boards is more or less optional š
Anything else I need to know?
Downloads:
Download design files here
Related information:
Note: Always read the “intro post” for additional important information about my designs.
January 11, 2017 4 Comments
What is it?
In response to a reader request, the project files for my V-FET PSU board shown here. Of course, this will also work for any other class A design you might think of, as it is a fairly standard CC-R-C configuration with onboard rectifiers and space for three 35mm snap-in capacitors per rail. On typical class A voltages that means youāll be able to use capacitors in the 22-33mF range and the the onboard rectifiers are 15-25A plastic SIP types, which should be just fine for most applications.
Input and output connections are via FAST-ON tabs and there are two sets of output connections. Since weāre paying for the copper on the boards anyway, Iāve tried to keep as much of it as possibleĀ with a top-side ground plane and the supply rails on the bottom. š
How big are the boards?
The board measures 3.1ā x 6.675ā (app. 78 x 170 mm).
What is the status of the boards?
Since the prototypes worked fine I havenāt made any changes and the board is therefore version 1.0.
Does it use any special/expensive/hard-to-find parts?
Nothing worth worrying about really. The only possible exception is only really the rectifier which is in a small GBU-package. However, Mouser has them up to 25A (p/n 750-GBU2510-G) and they are available from many other sources in 10-15A variants as well.
Anything else I need to know?
Downloads:
Download design files here
Related information:
Note: Always read the “intro post” for additional important information about my designs.