DIY passive attenuator
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cannikin
Well-known member
make it even easier....
buy a 4 deck 600 ohm or 10K from:
http://www.goldpt.com/sa1x.html
put it in your own case ...... done.
Thats what I did.
buy a 4 deck 600 ohm or 10K from:
http://www.goldpt.com/sa1x.html
put it in your own case ...... done.
Thats what I did.
gswan
Well-known member
I did one with a cheap switch and some signal relays to switch in combinations of 1dB, 2dB, 4dB and 8dB pads (giving 0dB to 15dB attenuation).
i got a few four deck elma switches so im building follow attenuator for my new monitor controller... http://www.goldpt.com/schm_ser.html
what are the resistor values if i want 1.0db steps =?
what are the resistor values if i want 1.0db steps =?
clintrubber
Well-known member
Various nice & low BOM-cost circuits around here, do a search.
NYD posted a fine & coarse 600 Ohm passive attenuator & maybe the circuit from I forgot his username (Mr Hinson his real name IIRIC) is still up.
[quote author="cannikin"]
http://idisk.mac.com/cannikin-Public/vumeter/inside.jpg[/quote]
Whoa, you had to add a power supply for the monitoring-stuff of a passive attenuator ?
:shock: :thumb:
NYD posted a fine & coarse 600 Ohm passive attenuator & maybe the circuit from I forgot his username (Mr Hinson his real name IIRIC) is still up.
[quote author="cannikin"]
http://idisk.mac.com/cannikin-Public/vumeter/inside.jpg[/quote]
Whoa, you had to add a power supply for the monitoring-stuff of a passive attenuator ?
:shock: :thumb:gswan
Well-known member
[quote author="king-rb"]i got a few four deck elma switches so im building follow attenuator for my new monitor controller... http://www.goldpt.com/schm_ser.html
what are the resistor values if i want 1.0db steps =?[/quote]
This one is not balanced and not constant impedance. It's just a simple resistor divider.
what are the resistor values if i want 1.0db steps =?[/quote]
This one is not balanced and not constant impedance. It's just a simple resistor divider.
Here's a calculator to find out the steps and resitors:
http://homepages.tcp.co.uk/~nroberts/atten.html
I have made a passive attenuator for monitoring using elma 24pos. switch, simple but a lot of work...
You'll find a lot of info with google.
http://homepages.tcp.co.uk/~nroberts/atten.html
I have made a passive attenuator for monitoring using elma 24pos. switch, simple but a lot of work...
You'll find a lot of info with google.
pucho812
Well-known member
just use one of these. You would ahve to use the resistor calculator to find the values to put in but this 4 pole 22 position switch made by alpha will work nicely for you. Plus if you ever need to go balanced you can...
http://store.triodestore.com/4pol24posals.html
the price of around 25.00 US dollars is good
http://store.triodestore.com/4pol24posals.html
the price of around 25.00 US dollars is good
cannikin
Well-known member
[quote author="clintrubber"] Whoa, you had to add a power supply for the monitoring-stuff of a passive attenuator ? :shock: :thumb:[/quote]
No that was for the JLM vu meter buffers
:shock: :thumb:[/quote]No that was for the JLM vu meter buffers
clintrubber
Well-known member
[quote author="cannikin"][quote author="clintrubber"] Whoa, you had to add a power supply for the monitoring-stuff of a passive attenuator ? :shock: :thumb:[/quote]
No that was for the JLM vu meter buffers[/quote]
Yep, we both meant the same, ehh, monitoring by eye, not the monitoring by ear. The audio-path between in & out is all passive, right ?
:shock: :thumb:[/quote]No that was for the JLM vu meter buffers[/quote]
Yep, we both meant the same, ehh, monitoring by eye, not the monitoring by ear. The audio-path between in & out is all passive, right ?
cannikin
Well-known member
Yes completely passive :grin: :grin:
clintrubber
Well-known member
[quote author="cannikin"]Yes completely passive :grin: :grin:[/quote]
Note I didn't even mention the effective use of rackspace :wink:
I like it :thumb:
Note I didn't even mention the effective use of rackspace :wink:
I like it :thumb:
cannikin
Well-known member
You now me... I like things big, monstrous, and actually offensive in size.
Although god forbid I move into a smaller studio.
Although god forbid I move into a smaller studio.
clintrubber
Well-known member
:grin:
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