- Removing Large Electrolytics - 3 Updates
- microphone cable - 4 Updates
- TDA1085 - 1 Update
| Baron <baron@linuxmaniac.net>: Aug 23 10:45PM +0100 Cursitor Doom prodded the keyboard with: > the cap case - a long 1" dia aluminium tube with 3 tags at the > bottom going straight to PCB grounds. It's acting like a very > effective heat sink. Going to have to trash the caps from above.:( Have you tried making a soldering bit with a piece of split copper tube and a cooks torch to heat it. Apply to all the pins up at once. -- Best Regards: Baron. |
| "jfeng@my-deja.com" <jfeng@my-deja.com>: Aug 23 06:24PM -0700 Some styles of electrolytics may be particularly difficult to remove gracefully. The ground tabs of the FP style were often twisted for mechanical stability before soldering. And sometimes, the pins were folded over before soldering. |
| tabbypurr@gmail.com: Aug 24 01:27AM -0700 > Some styles of electrolytics may be particularly difficult to remove gracefully. The ground tabs of the FP style were often twisted for mechanical stability before soldering. And sometimes, the pins were folded over before soldering. If enough solder is removed, twisted tabs can then be twisted back. A bit of remaining solder can be ignored, it lacks enough strength to get in the way. Folded over legs can be pushed up with a soldering iron before attempting removal. NT |
| Fred McKenzie <fmmck@aol.com>: Aug 23 12:48PM -0400 In article <5OOdncqB1u8nbeDGnZ2dnUU7-Y3NnZ2d@giganews.com>, > Viking is a vacuum tube grid. And the D104 is a high impedance. > As such you want to use low capacitance cable. RG-- is not low > capacitance. You have a point, but is the higher capacitance enough to matter for a relatively short cable? Also, has the D104 crystal element held up over time? My recollection of microphones back in the 50s, was that a crystal element eventually "dissolves" in normal humidity. The D104C ceramic version was supposed to overcome that problem. Fred |
| Ralph Mowery <rmowery28146@earthlink.net>: Aug 23 01:06PM -0400 In article <fmmck-7D2614.12480123082018@46.sub-75-242-165.myvzw.com>, fmmck@aol.com says... > "dissolves" in normal humidity. The D104C ceramic version was supposed > to overcome that problem. > Fred My mic could have either a crystal or the ceramic element, I am not sure which. Like you mentioned, the crystal elements often did not hold up very well. Hard telling how old this one is as it was given to my by a friend that got it from a long gone ham. Four feet of the rg 58 type cable has about 120 to 150 pf of capacitance. There is 300 to 500 pf connected directly across the mic input of the transmitter inside at the mic connector. Again this is not hifi and 20 or 50 feet of cable where I am sure it would make a difference. |
| Fox's Mercantile <jdangus@att.net>: Aug 23 02:48PM -0500 On 8/23/18 12:06 PM, Ralph Mowery wrote: > Again this is not hifi and 20 or 50 feet of cable where>I am sure it > would make a difference. As in everything in life, you can make an attempt to do things the right way, or you can just say "fuck it, close enough." You asked if there was a difference and I said that there was and why. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| gregz <zekor@comcast.net>: Aug 24 07:28AM > rg 8x cable without degrading the audio. It is only for communications > quality speech. > I know all about RF type cable, but have not ventured into the audio. 75 ohm type would have less capacitance. Ideally you want 3 wire line. Ground common and hot. The D104 has rising peak 2-3 kHz and they sounded very intelligible to me, in fact others try to duplicate, either with electronics or other mikes with similar response. Guitar cable should also do fine. Greg |
| Baron <baron@linuxmaniac.net>: Aug 23 10:34PM +0100 Baron prodded the keyboard with: > I'm trying to find either a reliable source for a TDA1085 Ic or a > direct replacement. Failing that a functionally equivalent device. > Thanks in advance. Hi guys, Sorry for the late response, just got out of hospital. Thank you guys, for your help. It looks like Rochester is the official stockholder for ON Semi and they have the genuine item. It would be nice if there was a functionally equivalent device but apparently not. This device is a triac driver with tacho generator feedback intended to control washing machine universal motors. -- Best Regards: Baron. |
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