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discrete amps
Dynahi
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front |
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800x600 52kB 800x600 51kB 800x600 41kB 800x600 43kB |
frontpanel by Frontpanelexpress.com
Enclosure from Schuro.de
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rear |
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800x600 45kB 800x600 60kB |
rearpanel by Frontpanelexpress.com inner side chrome plated to conduct protective earth |
inside |
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800x600 85kB 800x600 114kB |
0.45K/W heatsinks Avel-Lindberg encapsuled toroidal transformer Alps RK27 blue velvet volume pot Bulgin-like 2x2 pole toggle switch |
djgardner Dynalo / Dynahi page
β22
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frontpanel by Frontpanelexpress.com
Enclosure from Schuro.de
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β22 amp boards biased to200mA
polycarbonate / polyamide screws, washers, nuts and standoffs for electrically isolated mounting
all transistors are matched
electrolytic caps are Panasonic FM/FC, all other are high quality film caps (no ceramic caps used)
ε12 mute delay and offset protection from AMB.org
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Alps RK27 50k blue velvet volume pot
acrylic insert and panel mounting plate, insert lighted by ultrabright LEDs
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σ22 PSU from AMB.org
potted and shielded toroidal transformer with additional shield between primary and secondary winding, 2x 30V
earth connected to the case through a ground loop braker
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β22 pages at AMB.org
Cavalli-Kan Kumisa-III
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frontpanel by Frontpanelexpress.com
Hammond 1455Q2202BK enclosure
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Alps RK27 50k blue velvet volume potentiometer
30VA 2x15V toroidal transformer
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electrolytic capacitors: Panasonic FC / FM
smaller capacitors: boxed film (Wima FKP / MKS / FKS / MKT)
output transistors: Toshiba 2sc3422 + 2sa1359, biased to 40mA
output transistors mounted electrically isolated by polyamid screws to bottom of the case
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Kumisa III pages at AMB.org
build-related discussions at headwize.com
Dynalo
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front- and rearpanel by Frontpanelexpress.com |
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toroidal transformer, Dynalo PSU, Alps Blue Velvet Volume Pot
Panasonic FM electrolytic caps
Wima MKP and Intertechnik Q4 polypropylene film caps
silvered mica compensation caps
gain set to 12 by 0.1% Vishay CMF55-143 resistors
2sj109 / 2sk389 / 2sa1015 / 2sc1815 transistors
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illuminated volume knob, headphone jack integrated into a window |
djgardner Dynalo / Dynahi page
Dynalo
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front |
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800x600 108 kB |
by Frontpanelexpress.com |
board |
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800x600 135 kB |
design by Dr. Kevin Gilmore 2sj109 / 2sk389 / 2sa1015 / 2sc1815 |
djgardner Dynalo / Dynahi page
Dynalo (mod)
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front |
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800x600 101 kB |
by Frontpanelexpress.com |
board |
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800x600 143 kB |
design by Dr. Kevin Gilmore used transistors: 2sj109 / 2sk389 / sb647 / sd667 (=sc1627a) |
rear |
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800x600 99 kB |
by Frontpanelexpress.com |
djgardner Dynalo / Dynahi page
Elektor discrete
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front |
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800x600 ? kB |
built somewhere in the 90s, pics soon to come |
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