![]() Canton made a number of similar switchers, under the names Connect and Combi. Like the Heco box, it comes from the mid-70s and was part of the line designed to march the style of Braun receivers. The divider is stronger than in the Pioneer, resistors are 385 ohm (+) and 68 ohm (common ground).Ĭanton Connect 50 is German too. Inside there are 6 resistors, the extra two (2.5 ohm) resistors are wired to speaker sockets and used for impedance matching if you select more than one pair of speakers. You can also select either one pair of speakers or the pair connected to sockets “I” and either of speakers connected to sockets “II” or “III”. This box gives you more possibilities: in addition to headphones you can connect not one, but three pairs of speakers and select headphones only, speakers only or both. Typically for German devices from that period it has DIN speaker wire sockets and headphone socket, but there’s a regular 6.3 socket too. ![]() “UT” stands for “Umshalt Tastatur”, which is German for ” switching keyboard”. Heco UT 3 is German and a bit later than the Pioneer box, the earliest mention I’ve found is in 1974 catalogue, and it was still being made in 1981. It is also very simple inside: there are only 4 resistors, two of them (8 ohm) are wired to common ground, the other two (100 ohm) are wired in series to headphone connector + (one per channel). It has one pair of wires that you connect to the amp’s speaker outputs, one pair of speaker outputs to connect your speakers to, a 6.3 mm headphone socket and a switch that allows you to select speakers, headphones or both. It was manufactured in the late 1960 and early 1970s. Pioneer JB-21 is the oldest and simplest such device I could find. Good news: you can still use speakers whenever you want (well, in most cases). What prevents you from connecting a similar circuit to the amp’s speaker outputs? In most cases absolutely nothing! You don’t even have to tinker yourself either, several manufacturers have already done that for you. Now, say you have one of those amps that don’t have headphone sockets. 2 resistors per channel are all it takes to do that. You take the amplified signal you already have (for speaker outputs) and drop it to the level that headphones can handle. The reasons for this solution are that it’s as simple and as cheap as it gets. In most amps and receivers, especially those from the 20th century, the signal for the headphone jack is taken from the amp’s outputs via a simple voltage divider circuit that usually consists of 2 resistors per channel. That’s not the end of the world though, the solution to this problem was ready decades before these amps were made. Neither do many power amps, or their matching preamps for that matter. You want to use headphones but your amp does not have nice little hole to plug them into? Well, few of mine sure don’t, including some of my all-time favorites like Exposure Super XX or Cyrus One. Why can't it find sunvox.so? It's sitting there in the directory root from which I'm running erl. "cannot open shared object file: No such file or directory" But - (sv_demo) erlĮrlang/OTP 20 ġ> erl_ddll:load_driver(".", "sunvox.so"). (sv_demo) I really want/need to use Erlang for this, not Python and was hoping to do so via the port driver mechanism. Type "help", "copyright", "credits" or "license" for more information. ![]() It works fine with Python 3.6 via ctypes, so I don't think it is corrupted - (sv_demo) python It's a small embedded synthesizer - having extracted the zipfile I'm using sunvox_lib/linux/lib_x86/sunvox.so and changing permissions via chmod 755. ![]() The shared library is available from here. I'm using Ubuntu 18:04 and have this C++ shared library I want to work with from a dynamic language.
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