Mottlefeeder

Still on the theme of limiting, I've been looking at the analogue side. Some headphone amps include limiting, and some don't, but none appear to have a limit that can be set to suit the sensitivity of the earphone, so a more sensitive earphone could still provide hearing damaging levels if used for too long at too high a volume. Also, if you use the headphone output of a mini-mixer to provide your monitor signal, you have no protection. Quite a lot of internet information is about limiting long-term noise exposure, and since we have already made the lifestyle choice to reduce the noise, that is unlikely to be relevant to us. That leaves us with protecting against feedback, mics being dropped, active instruments being plugged in to live channels etc. Headwise, a headphone enthusiasts' discussion forum, suggested the circuit below for headphone limiting, when placed between the volume control and the headphone amplifier, but it is not much use if you have an off-the-shelf unit. However with suitable component changes, the idea can be used between the headphone amplifier circuit and the headphone. Unfortunately, the headwise site is no longer with us, and I cannot find its successor. Wickipedia has an article on headphones https://en.wikipedia.org/wiki/Headphones [ref 13] that contains a link to this limiter calculator which uses the same circuit idea, but calculates resistor values based on the impedance and sensitivity of the heaphone. http://www.jensign.com/S4/calc.html So, if you have a target maximum dB, and you know that the diodes are going to limit your available voltage (Vs) to 0.7V, you can calculate the resistance you need to achieve the limit target. Canford audio suggest a maximum permissibe limit of 93dB peaks to keep within the law https://www.canford.co.uk/TechZone/Article/HeadphoneLimiters, but I also found a recommendation of 100dB for transients .https://en.wikipedia.org/wiki/Headphones [ref 14] Taking the Shure SE215 as a worked example, it has an impedance of 17 ohms, and an efficiency of 107dB/SPL/mW. Assuming cable resistance can be ignored, set Rs to 0.1, and set R2 to 10000, since it will have no effect compared with the headphone impedance. Entering these figures into the calculator (note the value is efficiency, not sensitivity), and setting Vs to 0.7 gives the value of 200 ohms for R1 to limit the headphone sound level to 99.5dB. In summary, two diodes and a resistor, per channel, and you have a limiter dedicated to your earphones. David

Dunlop do a two-part plastic washer that fits over the stud, and then reduces the hole size with a half-turn of one of the parts. None of my basses leave home without them fitted, and so far I have had no failures. They are cheap (~£5 for a pair) and do not involve modifying the bass. David

I'm a pessimist/(boy scout in a previous life?), so I would go with this solution, but also buy the splitter in case one of the amp/speaker sockets failed. My mantra, if it can fail, sooner or later it will, so have a backup with you. David

This one started as a kit Jack clone, but with a basswood body was heavier than I had hoped for. A few sketches later and I took the plunge - I used it strung BEAD for a while, then moved on to a Hohner B2V David

Hi Scales, I'm not sure where you are based, but I am using a home-brew 1 by 10 that weighs about 7 kg. The build thread and drawings are here I roam around south Manchester / Warrington / M6 J20 and if you are in the vicinity you are welcome to come and audition it. David

I can't answer your question, but it sounds similar to the problem I am trying to solve. If you are thinking in terms of noise isolation and hearing correction with passive ear plugs, the best you might find would be a generic frequency profile that may or may not suit you. An alternative is to go for a hearing aid that carries two profiles, one for every-day use and one for use with moulded inserts to give you the isolation you need at gigs. David

I think your first question ought to be whether the screw-thread of the tuner has stripped, or the thread inside the string-holder block. The latter can often be fixed by drilling oversize and fitting a threaded insert, and I'm not sure what you can do with the former. Having said that, by the time you have bought the right size of drill, bag of inserts and any other tools you might need, it might be cheaper to buy a new bridge for about £30 on ebay. David

T-nuts are prone to pull out with very little sideways force - like dragging your cab across the floor. Insert nuts might be a better bet - https://www.screwfix.com/p/insert-nuts-type-d-m6-x-20mm-50-pack/61859 David

There may be other possible causes that could be investigated, for example, interference from fluorescent lights close to where you play, or gaming machines on the same circuit etc. Try plugging in elsewhere in the pub and see if you have the same problem. David

Much the same as you, but also DI box, Music stand Head torch Battery tester Spare batteries for tuners: AAA and CR2032 Basic multimeter Various connector convertors to connect to other peoples' gear Jack to speakon, XLR to jack, 3.5mm stereo jack to mono 1/4 jack Jack to phono I also carry spares for the band small mixer to put everything through my amp if the powered mixer fails. PA length speakon lead David