Hi, http://www.youtube.com/watch?v=stobfk1Mfjk It's interesting, but I'm not sure about playability... even as solo instrument... of course it's fun... Br, ...
243
Gergo Palatinszky
palagergo
Apr 1, 2011 7:46 am
Jeahhh and I'm thinking about the special date as well: Today is first of April :O) Br, Pala From: kepptheremins@yahoogroups.com...
244
palagergo
Apr 3, 2011 8:25 pm
Hi, I've reached the phase when I can power up the Power/Amp. part of the theremin ... After a while R29 (3k Ohm) getting too hot(burned me) so I switched off...
245
Mark Keppinger
thereminmaker
Apr 3, 2011 9:55 pm
Pala; It will get hot, but perhaps not that hot. What is the voltage on either end? Mark ... From: "palagergo" <gergo_palatinszky@...> To:...
246
palagergo
Apr 5, 2011 9:21 pm
Hi, OK, I wire two 10W 1.5k Ohm in series (giving 20W) and put heat-sink around it to have the safety for the measurement...(was warm but I can keep touch the...
247
mkepp@...
thereminmaker
Apr 5, 2011 9:32 pm
Pala; Okay, that gives you around 13 watts, which is okay. Remember; some of the current will be supplying the oscillators; the remainder will be passing...
248
palagergo
Apr 5, 2011 9:40 pm
ps.: with 3k it means 12.3W needs with 4.8k it means 7.7W needs...
250
palagergo
Apr 5, 2011 9:45 pm
Hi, Yepp thank you, so how do you see, which is the best way? a.: Leave my 3kOhm 20W setup there b.: Increase the series resistor somewhere closer to 4,8kOhm...
251
mkepp@...
thereminmaker
Apr 5, 2011 10:24 pm
If you increase the series resistor value, be sure there is enough current to run the three oscillators, and you might put a milliammeter in series with the...
252
Philip
kmg5443
Apr 6, 2011 4:17 pm
Same problem here. I adjusted the grid shunt resistance to about 80K on the oscillators. It worked, but in doing so shifted the bias point we believe; the...
253
Philip
kmg5443
Apr 6, 2011 4:22 pm
If this is the big ceramic voltage dropping resistor, it may fail. Mine did. I increased the power handling from 10 to 20W and have had no problems since...
254
Philip
kmg5443
Apr 6, 2011 4:24 pm
Mark Any news on the PC board design theremin? Philip...
255
mkepp@...
thereminmaker
Apr 6, 2011 4:28 pm
Philip; Funny you should ask. I brought my prototype with me today to show tonight's class (I'm once again teaching electronics at a local college). I have a...
And yes, a 3Kohm, 10W resistor does get hot enough to burn you with 42mA shoved through it. Mine did, until it burned itself up and shifted its R value to...
258
mkepp@...
thereminmaker
Apr 6, 2011 4:49 pm
Correct you are, Sir Philip! mk ... (desired B+) = 125V (drop across R29), @ 3 Kohm ... 20 watter. ... applied to the plates. You want to be careful about...
259
Gergo Palatinszky
palagergo
Apr 6, 2011 7:25 pm
Hi, 275V secondary is AC, after 5Y3 full wave rectifier its turned to DC and definitely higher (mine was ~350V). Why could you calc with 275V? Thanx br, Pala ...
260
Philip
kmg5443
Apr 7, 2011 3:34 am
Dunno. Are you using a Hammond 270EX?...
261
Philip
kmg5443
Apr 7, 2011 3:59 am
"Dorit Chrysler will be performing theremin with Trentmoller at Refuge in Portland, OR on Friday, April 15th. You can register here to win free tix to the...
262
Gergo Palatinszky
palagergo
Apr 7, 2011 7:04 am
Hi, I'm using Hammond 370EX only the primary voltage is different... Br, Pala From: kepptheremins@yahoogroups.com [mailto:kepptheremins@yahoogroups.com] On...
263
Gergo Palatinszky
palagergo
Apr 7, 2011 7:12 am
I understand the Power supply as: Tr. Secondary.: 275V (AC) -> 5Y3 full wave rectifier: ~350V(not well regulated DC, labeled to B+) -> OD3/VR150 voltage...
264
Jean Lucas
lucasjean92
Apr 9, 2011 5:08 pm
Hello Pala, I was just looking at the photos you posted on the site, and I was wondering about the type of the sockets located on the back, which have 4...
266
Philip
kmg5443
Apr 10, 2011 2:33 pm
This is bizarre: One of the toys Jordan and I took to a poorly attended radio event yesterday was a US Navy PDR-27S geiger counter. As soon as I got it out of...
267
Gergo Palatinszky
palagergo
Apr 10, 2011 7:38 pm
Hi Jean, Yepp, this 4 pole connector + an RCA or Jack connector are a perfect pair for the theremin - chassis connections (and you got a amplifier mono-block...
268
Jean Lucas
lucasjean92
Apr 10, 2011 8:35 pm
Hi Pala, Many thanks for your answers. Your offer is very kind, but now that I know more about the exact type, I'll try to find a shop here in France which...
269
Jean Lucas
lucasjean92
Apr 10, 2011 8:55 pm
Pala, I've just found it here in France: http://www.stquentin-radio.com/produit/audio/fiche-cb-4br-male/8536/6-0-0.html ...
270
Kendrick Sellen
kendricksellen
Apr 12, 2011 2:06 pm
tube opamp from the web. this is I based my some of my designs on. Just keep this on storage. I have no backup! Craig s...
271
Gergo Palatinszky
palagergo
Apr 13, 2011 7:59 am
Hi, Some other stuffs http://philbrickarchive.org/ Br, Pala...
272
Jean Lucas
lucasjean92
Apr 13, 2011 8:49 am
By looking further about 4-pin mic connectors, I found that the voltage and current ratings were 0.5A / 50 V ( ...
273
Gergo Palatinszky
palagergo
Apr 13, 2011 8:56 am
Hi, I’ve used this connectors for my other power supplys sometimes carrying 230V AC at 1,5A and has no trouble for years, soldering ends have to be isolated ...
