Ynot Posted June 24, 2018 Share Posted June 24, 2018 just an idle thought which might help when repairing mic heads.Is there such a thing as a small self-contained amp/speaker with a mic level 3.5mm jack input that one might use after repairing mics? Just thinking that rather than the usual test of plugging into a transmitter pack & sending it through the desk, it could be an easier way. I daresay an amp with a 1/4" jack input and an adaptor cable would suffice, but keeping it neater with the 3.5mm would be best. Anyone seen such a thing? Link to comment Share on other sites More sharing options...
themadhippy Posted June 24, 2018 Share Posted June 24, 2018 A gutar practise amp? Link to comment Share on other sites More sharing options...
Dave m Posted June 24, 2018 Share Posted June 24, 2018 Ms101?https://www.studiospares.com/search.aspx?eaSearch=Yamaha%20powered%20speakerI have several Link to comment Share on other sites More sharing options...
Ynot Posted June 24, 2018 Author Share Posted June 24, 2018 Ms101?https://www.studiospares.com/search.aspx?eaSearch=Yamaha%20powered%20speakerI have several Was going to say that will do nicely, but then saw the £115 price tag!A guitar practice amp is likely too big as well - thinking of a workbench item, so nothing that's going to take up too much space... Link to comment Share on other sites More sharing options...
smalljoshua Posted June 24, 2018 Share Posted June 24, 2018 Can't comment on audio quality but how about this circuit from eBay plus PSU and driver? Whatever you go with, it'll need the Bias voltage for the presumably condenser mics wired for Senny packs? https://www.ebay.co.uk/itm/DC-5V-12V-6V-Micro-Electret-Amplifier-Condenser-Microphone-750mW-AMP-YS-/282871017118 Josh Link to comment Share on other sites More sharing options...
sunray Posted June 24, 2018 Share Posted June 24, 2018 I did exactly this with a single 741 op amp and a very few resistors and caps, built it into a dead transistor radio from the 60's.LS, volume control, battery clip and hole for a 3.5mm stereo socket, were all there waiting. Link to comment Share on other sites More sharing options...
cedd Posted June 25, 2018 Share Posted June 25, 2018 I've wanted one of these for a while, but the bias voltage has always been the thing to trip me up. I use Trantec so 4 pin mini xlr. The bias voltage is therefore delivered on a separate pin to the audio, so to properly replicate the pinout I can't use one of the circuits Josh links to (I'd looked at them myself) as it delivers the bias on the mic pins. I think it'd still energise the capsule but it doesn't reflect the pinout so if I've got a dodgy bias link inside the plug it won't show it up. Link to comment Share on other sites More sharing options...
sunray Posted June 25, 2018 Share Posted June 25, 2018 I've wanted one of these for a while, but the bias voltage has always been the thing to trip me up. I use Trantec so 4 pin mini xlr. The bias voltage is therefore delivered on a separate pin to the audio, so to properly replicate the pinout I can't use one of the circuits Josh links to (I'd looked at them myself) as it delivers the bias on the mic pins. I think it'd still energise the capsule but it doesn't reflect the pinout so if I've got a dodgy bias link inside the plug it won't show it up.No problem, fit a cap between the audio pin of the socket and the audio input to lose the bias then add bias (a single resistor may be sufficient) to the bias pin. Link to comment Share on other sites More sharing options...
sandall Posted June 25, 2018 Share Posted June 25, 2018 I've wanted one of these for a while, but the bias voltage has always been the thing to trip me up. I use Trantec so 4 pin mini xlr. The bias voltage is therefore delivered on a separate pin to the audio,....My Trantec kits all have 4-pin Lemo connectors, but as all my mics use single-core cable (or in the case of the MKE-2s are connected as if they were single-core) I only need to use the Audio+Bias pin. Link to comment Share on other sites More sharing options...
Lamplighter Posted June 25, 2018 Share Posted June 25, 2018 I have a small battery operated amplifier for trouble shooting mics in the wild. It is slightly larger than a Trantec S5 belt-pack.I haven't worked out how to put a PDF onto the forum, so if you would like the circuit, PM me.Brian Link to comment Share on other sites More sharing options...
MarkBarl Posted June 27, 2018 Share Posted June 27, 2018 The absolute correct item to use is The Sennheiser MZA900P. Unfortunately it is really expensive. We did take the plunge to purchase one, right tool for the job. Link to comment Share on other sites More sharing options...
Brian Posted June 27, 2018 Share Posted June 27, 2018 A guitar practice amp is likely too big as well - thinking of a workbench item, so nothing that's going to take up too much space... Think again. I have a couple of these as 'toolbox' amps... Link to comment Share on other sites More sharing options...
Ynot Posted June 27, 2018 Author Share Posted June 27, 2018 A guitar practice amp is likely too big as well - thinking of a workbench item, so nothing that's going to take up too much space...Think again. I have a couple of these as 'toolbox' amps...Now THAT is something budget enough to try :)Cheers Brian Link to comment Share on other sites More sharing options...
alistermorton Posted June 27, 2018 Share Posted June 27, 2018 There's a Marshall one barely bigger than a fag-packet, too. Link to comment Share on other sites More sharing options...
Jivemaster Posted June 27, 2018 Share Posted June 27, 2018 Do mini external speakers for desk top PCs still exist. At least as a basis for experiment one with a battery and a suitably made input with power, might make something usable. https://www.ebay.co.uk/itm/Mini-Clip-on-USB-Stereo-Speaker-Audio-Speaker-Musicbox-Controller-Controlle-Z2R2/302759662710 Link to comment Share on other sites More sharing options...
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