magnetic memory

[arivel]

no, you're wrong .
the recommended F-ram memory interests me but it takes a circuit that commands it.

 

[gophert]

no, you're wrong .
the recommended F-ram memory interests me but it takes a circuit that commands it.

A circuit? You mean a microcontroler? How does that meet the design criteria you limited us to in your first post?

 

[Les Jones]

The F-ram will work BUT you have to be prepared to design the control logic to drive it. What is the full story of the device that contains this counter that you need to save the contents of ? If we knew that we may be able to find a solution by a different means to saving the contents of your counter.

Les.

 

[arivel]

volume control relays

 

[ChrisP58]

volume control relays

As in relays that select taps on a resistor string?

6 bits works out to 64 states. Are you really using 64 relays?

Have you considered using a digital pot?

 

[Pommie]

Are you really using 64 relays?

Won't 6 relays give you 64 levels with a binary resistor array?

 

[ChrisP58]

Won't 6 relays give you 64 levels with a binary resistor array?

Yes, if he can live with a linear progression. But I don't think that a logarithmic progression (which is what's usually used for audio) could be made to work with a binary array.

But I'm open to the possibility.

 

[arivel]

a logarithmic scale that uses the binary system doesn't work?

 

[ChrisP58]

a logarithmic scale that uses the binary system doesn't work?

I don't think so. But then again, I've never tried to make one, so I'm not going to say it can't be done.

Do you have a binary stepped circuit with a logarithmic behavior?

 

[Les Jones]

I think a motorised potentiometer type volume control would be the simplest solution for the TS as it would stay in the last position selected when powered down. I can't find just the motorised potentiometer part but there are many with the control circuits on ebay.

Les.

 

[rjenkinsgb]

Good idea. ALPS linear slide or rotary ones are readily available, eg.

Alps 10K Slide Potentiometer Motorized N-Fader Touch Sensitive linear | eBay

Find many great new & used options and get the best deals for Alps 10K Slide Potentiometer Motorized N-Fader Touch Sensitive linear at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

ALPS 10K 6-gang Potentiometer motorised Pot logarithmic RK168 D10K RK16816MG | eBay

ALPS Alpine Japan RK16816MG 6-gang High-End motor driven potentiometer 10KDx6 special - - Manufacturer ALPS Alpine Japan - Part number RK16816MGA0A - Total resistance 10K ohm - Resistance characteristic logarithmic (D special) - RoHS compliant Yes - Number of resistors elements 6-ganged-unit -...

www.ebay.co.uk

 

[arivel]

the operating principle is the one in the annex.
the switch contacts shown are those of the relays. the two resistances connected to each contact are calculated to obtain an attenuation in db.
when the outputs of the 2 binary counters are all at zero the switch contacts are all closed and all the resistors are bypassed. on the contrary when the outputs are all high, all the switch contacts are open and all the resistors are used.