ELTIM blog

COVID-19 news:  ELTIM audio is in the northern part of the Netherlands where in a wide area no Corona cases are reported. For 20 years we already lived and worked in the same building, so no travelling problems. Actually, we are running as always.
All our suppliers ship out goods, maybe a day or two delayed.

April 2020
Small orders
Unfortunatelly we are confronted with an increasing number of very small orders (0,50 - 5,00....), f.e. two 0,6W resistors, a single fuse, etc. Mostly it are components not available elsewhere or at a higher total charge.So far we charges a low tariff for shipping this in an enveloppe.
From now on we only charge a parcel tariff and see a possible difference in true freight charge as a compensation for our financial losses while processing these small orders.

April 2020
DIY kits
Since there are only a very few quality DIY audio kits available in the market, we believed that offering our ELTIM modules as kits would be nice. It appears that this was a mistake. Despite the fact that mostly the module itself will work fine, we are confronted with troubles, costing us a lot of time, and worse: our good name. We helped out some of them to find out why this happens. We found incorrect mounted components (based on fora "tips"), shortcuts, bad solderings, bad mechanical work, incomplete or bad wiring, poor power supply design, not reading docs, etc. etc. After correcting this, all worked as it was intended to !
From now on we sell our amplifier and power supply program as ready and tested modules only, all working perfect, despite what you read elsewhere. As DIY'er you have to find out what you did wrong if it doesn't work properly! Most important: read the documentation.
We also use the same modules for our handbuilt bespoke amplifiers. These are sold to audiophiles, judging our designs as everybody should do: judge the sound experience. Some of them even state that our designs are outplaying designs costing even 4x more. Not, €500,- amps, but €10.000+ ones. Some say that they even sound better than high ranked and regarded, conventional built true Class-A designs with 5 fugures. So, some of the ones spending little money say it's bad (killing our good name on fora), the ones spending a lot say it's a bargain (writing and even demonstrate it all over). Strange, isn't it?

March 2020
During 2019 we were in the final stage of finishing our first preamplifier, based on our ELTIM Pre-330 preamplifier module. For the introduction at X-Fi show 2019 in Veldhoven NL we needed some extra in/output modules to finish it as we wanted it. We mounted it in a MODU Slinline 450x230x120mm cabinet.

The preamp of the picture above did well at the show and afterwards we put it on an empty desk in our office, playing old records via a pair of small active speakers. At the moment we use the preamp part of a Pre-330+ module with 16 impedance and 16 gain setting via HEX rotary switches in the bottom, also working fine.
We made a short You Tube while testing our MM/MC preamp section with our 45 years old Sony PS-40X / Goldring G900-IGC combination. Playing right out of the box where it was for about 25 years.

Back home, i was wondering why i made these extra modules so small, where there is enough space in the cabinet. Obviously sometimes i also have the same idea of making it as small as possible as many other designers tend to show somehow.
So, all modules thrown away and started all over again with redesigning these extra in/output buffer modules in our "spacy" way. By the end of March 2020 we will have them ready with following cabinets in our mind:

Just the Pre 230/330 modules exactly fit in a MODU Slimline/Galaxy 1U (44mm) high cabinet with a depth of 170mm, where just RJ152G or chassis connectors are mounted.
               RCA line signals only. No front panel PCB available. All fits without extra wiring except for selector switch (5V). You could use Ø25-30mm knobs.
               There will be hardly any frontpanel spaceavailable for lights and a display though.

While using our newly developed  2U in/output modules, the base is also Pre-230/330 in a MODU Slimline/Galaxy 2U (88mm) high cabinet in a depth of 230mm.
               It all fits exactly with the extra 2U modules. While using those, about no wiring is required at all.
               RCA Line and XLR balanced in/out modules and even a Phono input module (line and quasi balanced XLR inputs) with fixed settings available soon.
               We have the frontpanel PCB's for Slimline 2U and Galaxy 2U/330mm cabinets available, connected directly to Pre-230/330.
               You could use Ø30-40mm knobs. Compressed lights space and possibly a very small volume display.

While using our newly developed  3U in/output modules, the base is also a Pre-230/330 in a MODU Slimline/Galaxy 3U (120mm as picture) high cabinet in a depth of 280mm.
               It all fits exactly with the extra 3U modules. While using those, about no wiring is required at all.
               RCA line and XLR balanced in/out modules and even a Phono input module (line and full balanced XLR inputs) with (possibly?) multiple settings.
               These phono stages are direct at the input and use larger (better) RIAA capacitors as on the Pre-230/330+ already.
               We have frontpanel PCB's for Slimline 3U (picture) and Galaxy 3U/330mm cabinets. With that there is no wiring required, directly connected to Pre-230/330.
               Up to 50mm knobs. With this front panel height, we (or you) could make it it as in the picture with all possible buttons and switches, all just leading 5Vdc!

In any of the cases above our VR-3 voltage regulator and any of our electronic VCA-volume control units fit. Even a PA-4989 headphone amp fits.

January 2020
After selling a number of signal buffer modules, new insights have been gained, including the fact that the prints were actually just a bit too small. We have made them a bit larger, so that they fit both a screw connector and extra components to connect them to high supply voltages (eg power amplifiers). Calculation of the correct series resistance is also no longer necessary. In addition, reasonably large input / output capacitors are fitted where required. You can now also opt for a chassis or screw connector for internal use. We have already produced a number:


20 June 2018
More than once we were asked if we could build amplifier modules in "ELTIM style" with the very well klown and behaving LM3886 amplifier IC of Texas Instruments. After some investigation we found out that there are a lot of those, all very cheap, small and using cheap components. If we wanted to do it as requested, we needed to use way better parts and PCB's. This results in higher costs.....  After some thinking we decided to go for it and designed several modules with this LM3886, as with our other Amplifier modules available with different power supply capacitors:
 
While concentrating on that, we also found it's brother, the LM 4766, beiing a stereo version (2x 50Wrms, 8ohms only!) and made similar ones with those as well. You even can combine all modules from both ranges in a compact pack and even add a "booster" pack containing a group of extra power supply capacitors. Both versions are available for connecting to a power supply, but there are also versions with on-board power supply where you just have to connect a transformer. Now we hope you will follow as well and buy these nice sounding amps. Price is higher than on Alibaba/Ebay, but the sound is way better and they last forever. ELTIM style, as requested -)  Extra info dec. 2018: they are a hit already, thanks.


17 March 2018
We finished developing a wide range of switching DC/DC voltage converter/regulator modules. With these modules you can extract energy from about any supply source (even boat/car battery) and convert/regulate it into the known low voltage supplies 3,3V; 5V; 12V or 15V or symmetrical and even mixes of them in an energy efficient way. Suppose you have 60V already available for your class-D power amplifier. Hook up one of our switching modules and you also have f.e. ±15V for a preamplifier/DSP  AND  5V for digital circuits available. We have all versions with a screw terminal and with headers, fitting most of our Power Supply modules directly.
We only use the very high quality, professional XP-Power modules with 800kHz switching frequency and efficiency around 90%.If there is space left on the PCB we also mounted RF filters resulting in absolute clean sulppy voltages.
Here our first built model: 9-36Vdc in,  ±15Vdc (0,33A) AND 5V (4A) out. Fits on most ELTIM Supplies!
12 March 2018
We now modified our PS-UNxx universal Power Supply modules for high power purposes and all have a square shape now. They all can be mounted over a corresponding type of transformer. Due to the extra PCB space we were able to mount more, and more types of capacitors than before. We also modified them in a way that besides our linear functioning Voltage Regulator modules, also our brand new switching DC/DC converter/regulator modules will fit. WIth these, you can extract low voltage (even symmetrical) Supply voltage(s) from a high voltage system without significant energy losses. Also, the output(s) are regulated as single, double or triple supply voltage(s).
5 March 2016:
In our never ending search for new and innovative electronics, we recently found Amplifier Power IC's, by CANAAN Semiconductor. New Class A, with Mosfets in the powerstage.Ideal and small amps for (high quality) headphones, PC speakers, etc. We have them with and without integrated Power Supply part:



13 september 2016:
We developed a range of volume control/buffer modules, forming the heart of f.e. our own preamplifiers.
Attenuation/gain can be set by a 0-4,8Vdc signal and/or by SPI serial data.

- VCA-2181x, three models in reference quality, using the higest quality parts and fully seperated channels.

- VCA-2180x, three models in High-End quality, using very good quality parts. Seperated VCA's.

- VCA-2162, a more cost effective version with dual channel VCA and buffer IC's.

All connections of all modules are the same, so they can be exchanged. You can even use the same software.
13 August 2017:
Our prototype monoblocks based on CS-40ps RQMB modules are running a few months now in a normal living room environment, just as you probably would use it. From the start they are running perfect and last week we finished them with the mounting of our Bin/Lout-1200 balanced input circuits.
Both models are also available in ready built monoblock amplifiers. We decided to release the CS-40ps RQMB and HRQ versions today, on Louis' birthday 13/8 -).
At first we believed power would be limited because of the quite small cooling surface of the cabinet, yet even while running the small RQ version at around 200W@4ohms they only get hand warm, even with a way higher idle current as we recommend in our documents.
8 August 2017:
Our ELTIM amplifier module CS-40ps HRQ is reviewed against HYPEX NCore by Uniqueradio.nl (in Dutch):
http://www.uniqueradio.nl/index.php/2017/07/zelfbouw-doen-of-laten-deel-1/
http://www.uniqueradio.nl/index.php/2017/08/zelfbouw-doen-of-laten-deel-2/
Some will be surprised about the outcome -)  LT

14 october 2015:
We found out that there is a lack in availability of (quality) symmetrical Power Supply modules.
Find them now with integrated Talema 700000 series potted toroidal PCB transformers in a range of 5-25VA under ELTIM Ampifier modules/Power supply modules/PS7xx ! Very low magnetic field, hum and noise rates due to fully equipped PCB's.
We only use high grade components like PANASONIC FR (10.000 hours @ 105ºC) capacitors, small caps over the rectifier diodes, etc.
If a regulated symmetrical voltage is required, you could add on of our VR-modules (as in the picture blow) to it. VR3 and VR-4 are adjustable. So, with these you even could make a small (±1,5A max) , symmetrical laboratory Power Supply !
In similar way, we also made more regular single voltage variants. With these you can add a 317 (TO220) Voltage regulator, incl. heatsink and extra parts. In that case there is an adjustable voltage available as well.
Due to the low profile toroidal trafo's, height is only 23-28mm, so you can even use them in 40mm casings.

21 August 2015:
In the little time we have in these busy days, we finally managed to built our DEMO amplifier, a A2300 HRW model with 16A EXICON Mosfets. Every time again it is nice to watch and hear a product from your ow hands coming alive and rewards you with a fantastic sound. But then again, who am I ??
Next week Bert Oling of oldest dutch magazine HVT will review it. Other reviewers are most welcome. We stopped this service, since people opened and "modified" it !
A2300 HRQ with 2x CS-40ps HRQ, 2x VS-20 (and MCap250-2,2), 2x VR-3/30, 2x 160VA/ 2x 30V trafo's and Kacsa connectors.
Last week mr. Bus built this also in one weekend after buying built and tested modules.


17 August 2015
It appeats that some of you dislike the Mundorf Mcap250 as we use as input capacitor on the VS-20 modules. Although we mention it in the corresponding document you can use the DC-input of any VS-module and connect ANY quality capacitor you like, hardwirded to the RCA input and DC-in connection of any VS-module. In that case the already on board capacitor is NOT used and so NOT in the signal path! We used this cap in order to allow people to buy an affordable VS-module and at the same time, allow people who want to spend more money and/or prefer an other input capacitor to do so. Since we have to take in mind that the VS-20 can be mounted in all cases, we can't mount a bigger one either. Perhaps later, a VS-30 module? Similar to VS-20, but 50mm instead of 35mm high probably. Let us know   BUT, the comments you can read so far, are with Mcap250........ So what more is there to dig out from the bottom of your music data????
Please take in mind that you CAN mount any high quality capacitor this way on our IO-modules, like in the picture below where a Mundorf EVO MESGO-2,2uF is mounted. Connect it to a side of our CS/VS-combination and use some short wires to connect the connectors to it.
Actually, if you are sure that the input signal is free from DC, there is no input capacitor needed and you can use INdc anyway. Our amps work from DC - 350kHz.
If you are using a balanced IO-module there isn't any capacitor in the audio line, from input to speaker output!

1 july 2014
Our own and first amplifier modules are ready for sale now. Dealers and OEM are most welcome as well