![]() Sometimes when listening to music it would get noticeably louder. I could hear the relays clicking when the amp was on with no music playing. Recently the volume started increasing without input from me on the volume control. Volume does behave normally when using the remote. Volume increasing when turning it down, especially when turning it down quickly. In the past year when using the volume control on the amp the volume has behaved in a random/erratic manner. With the control connections fro the volume control.I've had the pleasure of using my Cambridge Audio 840A for about 4 years now. IĪlso put 10dB of attenuation on the CD input to ensure thatĢVRMS full level doesn't doesn't stretch the volume controlĭon't ask how the preamp sounds, as I'm still struggling ![]() Gain of 10dB, so that 3.5VRMS will clip the latter anyway. In my preamp I follow the DS1802 with an output stage with a Noise, rather than distortion (I assume). Which is always positive relative to ground this must be The apparently rising IMD level with decreasing signalĪmplitude had me puzzled - this is normally a sign ofĬrossover distortion (as devices switch off at zeroĬrossing), but if the measurements are made with a signal (unfortunately disabling the zero-crossing function in the ![]() I floated the ground on mineīy attaching the AGND pin to -2.5V and the VCC pin to +2.5V ![]() Theĭata sheet insists that voltage at any point should beīetween -0.7V to +7.0V, which precludes negative signalĮxcursions, and suggests that keeping signal levels belowĢ.5VRMS, as ppl suggests. (analogue ground) or floated between ground and +5V. It isn't specified whether this is centred about 0V Reportedly carried out out with a "1VRMS" input signal, but The Audio Evaluation Report for the DS1802 (posted onĭallas' own site) is interesting and useful, but it leaves Again, thanks everyone for your time, much appreciated! I still need to find an IR decoder chip, one of the pages posted above has a kit with an IR decoder with learn function, which is pretty cool - if I could find out what that IC is. Now, all I got to do is see if my local components distributor carries these chips or compatibles, and see where to go from there. There were a number of IC manufacturers with good chips for digital volume control, some with up/down buttons and others with 3-line serial input which is great for interfacing with an infrared receiver and decoder.įor those interested in similar applications, check out these manufacturers' web sites:ĭallas Semiconductors - check series DS18xx and DS16xxĪnalog Devices - check series AD52xx and AD84xxĬrystal - CS3310 appears in a number of articles online. I was using the wrong keywords in web search engines, so as soon as I entered +digital +potentiometer +volume +control in the useful links started to pop on screen. ![]() Great ideas, everyone, thanks for your replies! I live in Eastern Europe, can mail order most circuits and equivalents from a nearby components distributor. any information will help: web pages, schematics, suggestions for circuits, anything. I'm not an electronic graduate, so take it easy with me. If anyone could help me build such an equipment, I'd really appreciate it. If possible, it would be great for the unit to retain volume level while powered off. The idea is to connect the speaker set through this unit to any audio source (like VCR, or satellite receiver, which don't have built-in volume control) and be able to adjust the volume from anywhere in the room. I would like to replace that potentiometer with an unit with digital control of the volume, Mute and Power on/off setting, which should be operated via an infrared remote control. The cable has a simple inline potentiometer to adjust volume, like an attenuator. The subwoofer has an amplifier built-in, and connects with a cable to any stereo headphone jack or RCA line out jacks (through an adapter). I have a set of satellite speakers and subwoofer made by Cambridge SoundWorks. ![]()
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