OTL Tube Headphone Amp Aikido White Cathode Follower 6SN7 6BX7
I needed a quick headphone Amp. Picked up a clone case from Epay along with a PCB. It's a simple build for some one just starting out. Or you can stuff it full of junk like I did. This one is set up for Sennheisers. It sounds quite nice.
I needed a quick headphone Amp. Picked up a clone case from Epay along with a PCB. It's a simple build for some one just starting out. Or you can stuff it full of junk like I did. This one is set up for Sennheisers. It sounds quite nice.
Lampie519 - Nice "nuclear suitcase" 
I am also currently building one in the enclosure of an old transistor measuring equipment.
I'm not figuring out whether I'll leave and repaint the existing front panel or make a new one from plexiglass maybe..may leave that transistor logo ...
I am also currently building one in the enclosure of an old transistor measuring equipment.
I'm not figuring out whether I'll leave and repaint the existing front panel or make a new one from plexiglass maybe..may leave that transistor logo ...
Attachments
Interested in the PCB
I'm very interested to build this to completion. Do you still have the PCB.
I'm very interested to build this to completion. Do you still have the PCB.
CMOY-like OPA1688 based amp with some additional features:
+/- 5V regulated split supply from a single 9V battery
output relay
switchable gain, +6dB, +18dB
automatic shut down after 5 minutes absence of audio signal (saves a lot of batteries)
low battery indication
DC protection
+/- 5V regulated split supply from a single 9V battery
output relay
switchable gain, +6dB, +18dB
automatic shut down after 5 minutes absence of audio signal (saves a lot of batteries
)low battery indication
DC protection
Attachments
Attachments
Same circuit, different interpretation :
The DAO SE all-FET Class-A ZGF Headphone Amplifier
The DAO SE all-FET Class-A ZGF Headphone Amplifier
Yet another :
The DAO SE all-FET Class-A ZGF Headphone Amplifier
Patrick
.
The DAO SE all-FET Class-A ZGF Headphone Amplifier
The DAO SE all-FET Class-A ZGF Headphone Amplifier
Yet another :
The DAO SE all-FET Class-A ZGF Headphone Amplifier
Patrick
.
Attachments
My high speed HPA is almost complete.
White acrylic front panel - hard to work with ... cracks appear if done incorrectly.
VU meter in the middle (round push button to switch between visual effects)
two tumblers: HPA / PRE and INPUT 1/2.
Indication - lazy variant - I had ebay digital voltmeters - if you paint some segments black - the letters H and P come out if 8 V voltage.
I wanted to show the inputs with 1 and 2 V, but I didn't have such a bright voltmeter anymore. Input indicator - with 2 orange diodes representing 1 and 2.
Accordingly, a little 9V auxiliary transformer with its own regulator. Alps 50K pot.
of course still need to be cleaned, especially the back panel ..where all sorts of markings remain. The photo does not show it so well, but in reality well visible H and P..
White acrylic front panel - hard to work with ... cracks appear if done incorrectly.
VU meter in the middle (round push button to switch between visual effects)
two tumblers: HPA / PRE and INPUT 1/2.
Indication - lazy variant - I had ebay digital voltmeters - if you paint some segments black - the letters H and P come out if 8 V voltage.
I wanted to show the inputs with 1 and 2 V, but I didn't have such a bright voltmeter anymore
. Input indicator - with 2 orange diodes representing 1 and 2.Accordingly, a little 9V auxiliary transformer with its own regulator. Alps 50K pot.
of course still need to be cleaned, especially the back panel ..where all sorts of markings remain. The photo does not show it so well, but in reality well visible H and P..
