In Reply to: recommended parts for dc darling 1626 amp posted by ballardmb57@earthlink.net on May 6, 2004 at 11:57:32:
Which version are you planning? Your link was to the "double DC darling", the DC-Darling is on Bob's site (link below).I rarely use anything smaller than 1/2 watt as I don't stock them, with that in mind, if you are planning the double darling:
The 66K resistor will dissipate around 1 watt, so use a 2 watt part (metal film is fine).
The cathode resistor for the output which is 3200 ohm 10w per the schematic - use a wirewound. It dissipates around 7.5 watts, so even a 25w resistor wouldn't be overkill, and keep it away from other heat sensitive components.
The two 100 ohm grid resistors on the 1626's should be carbon composition 1/2 watt.
I'd suggest adding a small grid resistor before the 8532 (1K 1/2w carbon composition). I had oscillation problems with the 8532 in my version until I added this. BTW, the 6J4 is the same tube and a bit more common.
The 358 ohm resistor can be 1/2w metal film
The 1M can be 1/2w metal film.
Enjoy, it's a great little amp - and lots of "bang for the buck".
Don't waste much on designer parts, cheap will work nicely.
There are no coupling caps - Given the cap values stick with electrolytics and watch polarity.
FWIW, the single "regular" darling (eg, not DC coupled) might be an easier first project. DC coupling can be a bit tricky at times.
- Gary
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Follow Ups
- Re: recommended parts for dc darling 1626 amp - Gary Kaufman 05/6/0413:12:19 05/6/04 (6)
- Regular Darling is a great first scratch build - Dr. Exotica 18:38:50 05/6/04 (5)
- Have a picture of your darling? nt - Bas Horneman 01:57:28 05/7/04 (4)
- A crummy one yes - Dr. Exotica 12:28:51 05/7/04 (2)
- Here is mine - Bas Horneman 13:07:16 05/7/04 (1)
- Here is yours.. :-) - Bas Horneman 14:27:18 05/7/04 (0)
- I'll show you mine if you show me yours! - Bas Horneman 07:15:47 05/7/04 (0)