Univibe photocells ?

[Gearbuilder]

Hi,
What are the  specifications of the cells found in a stock Univibe(MKY-78)
Where can i find the datasheet?
Bruno

[R.G.]

To the best of my knowledge, you can't.

I spent quite a while looking for that a few years back, no results. I think they were a custom number for the maker, whether they were a relabeled standard part or not.

[Gearbuilder]

Hi,
Thank you R.G., .I saw a shoot of a stock Univibe at the Fulltone website  and the cells have metal ring around them;are they stock cells?
I would try the  Mouser n° you give as the best LDR replacement type for your very good Univibe Clones but there's no Mouser distributors  in Europe but i've found three differents LDR at RS components.Could you help me to choose a model close to the Mouser's LDRs?
                                                                                                         

Spécifications techniques

Réf.:                                    NORPS-12    NSL19-M51
Pointe de réponse spectrale:    530 nm    550 nm
Résistance d’obscurité (min.):    1 MΩ    20 MΩ
Tension max.:    320 V c.c. ou c.a.    100 V c.c. ou c.a.
Temps de montée (typ.):    18 ms    45 ms
Temps de descente (typ.):    120 ms    55 ms
Dimensions (mm):     12,8 x h 6,3    L 4,2 x l 3,55 x h 1,46
Température d’utilisation:    -60°C à +75°C    -60°C à +75°C

réf.    résistance cellule    dissipation
Silonex    Ã  10 lux    Ã  1000 lux    max. (à 25°C)
NORPS-12    9 kΩ    400 Ω    250 mW
NSL19-M51    20-100 kΩ    5 kΩ    50 mW
Only  the NORPS 12 have got a metal ring

Spécifications techniques

    VT43N2
Pointe de réponse spectrale:    550 nm
Résistance de la cellule à 10 lux:    8 - 24 kΩ
Résistance d’obscurité:    300 kΩ
Tension max.:    250 V
Temps de montée (typ.):    90 ms
Temps de descente (typ.):    18 ms
Température d’utilisation: -40°C à +75°C

What model is the best suite  for an  Univibe clone?
Regards
Bruno

[Gearbuilder]

hi

[Gearbuilder]

There's nobody in there?
Bruno

[Toynbee]

Hi.  I found this thread looking for information about MKY-78 CdS photoresistors.  I scanned an article that might help in finding photoresistors that will work with a Univibe.

Experimenting with Photoresistors
Modern Electronics Sept 1988
https://od.lk/d/OV8xMDcxNTc0NTFf/LDRs-ME-Sept1988.pdf

[duck_arse]

nice find, Toynbee, and welcome to the forum.

[Toynbee]

Thanks.  Here's some patents on Univibe-like phase shifters.

US 3609205 Electronic Musical Instrument with Phase Shift Vibrato
similar to Univibe
http://www.google.com/patents/US3609205

US 3418418 Phase shift vibrato circuit using light dependent resistors and an indicating lamp
similar to Univibe
http://www.google.com/patents/US3418418

[Toynbee]

More patents

US 3737555 ELECTRICAL MUSICAL INSTRUMENT PHASE SHIFT VIBRATO SYSTEM
Darlington pair with FET
http://www.google.com/patents/US3737555

US 3256380 Cascaded phase shift core reactor arrangement for securing vibrato in an organ
In Hammond organ?
http://www.google.com/patents/US3256380


compare to:
http://solorb.com/elect/musiccirc/liquidator1/

http://sluckeyamps.com/warbler/warbler.htm