Do you know any drop-in replacement for the quad CMOS switch Toshiba TC9145P (similar to 4066 but 16-pin)?
Also trying to find a spec sheet, but seems to be unobtanium...(yes, I have checked alldatasheets.com)
Also trying to find a spec sheet, but seems to be unobtanium...(yes, I have checked alldatasheets.com)
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Thanks, but no reference to a spec sheet. I am not looking to buy a TC9145P, just trying to find out if the is a drop-in for it. 🙂
Ah, OK 🙂
That could be hard to find then. Best you might do is to find some service manuals that use it and see if they have a block diagram of the device. You could then look at how it operates (logic levels and so on).
That could be hard to find then. Best you might do is to find some service manuals that use it and see if they have a block diagram of the device. You could then look at how it operates (logic levels and so on).
^^^^^^ that.
Chiming in to suggest the same.
Do you want to build a project ?
In that case mod it to use easily available cheap plentiful switchers, CMOS or anything.
If you want to repair an amp with a broken one, just pay those 18 Euro and solve the problem, be happy that are still available at any price.
Would not expect any drop-in available because it´s very specialized, also "very Japanese" with those 3 "enable" pins directly connected to LEDs , very "80´s Japanese"
If you like playing Russian Roulette, there´s an AliBaba seller offering 10 of them for U$5, free shipping!
WHAT might go wrong?
https://oj.salongsnow.se/item/s2soiwouk
Again: as Mooly suggested, post the schematic using them, we may find lots of data there.
---------------------------------------------------------------------
EDIT: I found them in Brazil at a meager 6 Brazilian Reals, about U$2
I WOULD BUY ONE NOW.
TC9145P
EDIT 2: just found one (very Japanese although sign d by telefunken) schematic.
Although so described, they are NOT a 3 x SPDT switch (although it might be wired that way) but a 6 x SPST one.
Might be replaced by 2 x CD4066 or similar or 6 Fets.
You add your own Logic and Leds.
Or maybe do some neurosurgery and use currently available control signals and Leds.
Or do the sane thing and pay through the nose for a realone and end the problem.
No cheap and simple solution here.
For an example, following Mooly´s idea:
TELEFUNKEN HIFI-VERSTAERKER HA 800 HA 1800 SM Service Manual download, schematics, eeprom, repair info for electronics experts
Chiming in to suggest the same.
Do you want to build a project ?
In that case mod it to use easily available cheap plentiful switchers, CMOS or anything.
If you want to repair an amp with a broken one, just pay those 18 Euro and solve the problem, be happy that are still available at any price.
Would not expect any drop-in available because it´s very specialized, also "very Japanese" with those 3 "enable" pins directly connected to LEDs , very "80´s Japanese"
If you like playing Russian Roulette, there´s an AliBaba seller offering 10 of them for U$5, free shipping!
WHAT might go wrong?
https://oj.salongsnow.se/item/s2soiwouk
Again: as Mooly suggested, post the schematic using them, we may find lots of data there.
---------------------------------------------------------------------
EDIT: I found them in Brazil at a meager 6 Brazilian Reals, about U$2
I WOULD BUY ONE NOW.
TC9145P
EDIT 2: just found one (very Japanese although sign d by telefunken) schematic.
Although so described, they are NOT a 3 x SPDT switch (although it might be wired that way) but a 6 x SPST one.
Might be replaced by 2 x CD4066 or similar or 6 Fets.
You add your own Logic and Leds.
Or maybe do some neurosurgery and use currently available control signals and Leds.
Or do the sane thing and pay through the nose for a realone and end the problem.
No cheap and simple solution here.
For an example, following Mooly´s idea:
TELEFUNKEN HIFI-VERSTAERKER HA 800 HA 1800 SM Service Manual download, schematics, eeprom, repair info for electronics experts
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Wow!
Thanks for the very thorough answer. It is a three switch 4066 that also drives three LEDs. It is found in a Nak Cassette Deck 1 I attempt to refurbish, replacing elcos in the signal path etc.
I was interested in the distorsion figures and since the TC9145P sometimes can fail, to have a backup IC for drop-in. I see in spec sheets that similar Toshiba units from the same time period with more switches and LED drivers have very good distorsion specs...
Golden ears accuse the 4066 of everything from bad sound to the bubonic plague.
Thanks for the very thorough answer. It is a three switch 4066 that also drives three LEDs. It is found in a Nak Cassette Deck 1 I attempt to refurbish, replacing elcos in the signal path etc.
I was interested in the distorsion figures and since the TC9145P sometimes can fail, to have a backup IC for drop-in. I see in spec sheets that similar Toshiba units from the same time period with more switches and LED drivers have very good distorsion specs...
Golden ears accuse the 4066 of everything from bad sound to the bubonic plague.
Well, I mean you have to know what you're doing to get best performance out of these old 40xx jobs. Supply range is kind of limited and slightly inequal voltages near max may be required for best performance, and whenever nonlinear switch rON is a concern, loading needs to be kept as high impedance as possible (preferably at least 1 Megohm across the audio band), since what you have is a voltage divider with a partially nonlinear element. You can pretty much determine how much distortion to expect at a given signal level and offset using datasheet rON(V) graphs if source + load impedance is known. Better than about 0.03% at typical line level may prove a bit of a challenge.
Clearly not every equipment designer has the kind of dedication to squeeze the maximum out of their CMOS switches, much less so if we're dealing with a rather nonlinear medium to begin with, like tape. Things just need to be good enough to not appreciably degrade performance of all the rest (medium and other electronics) under those circumstances.
Here's a block diagram of the TC9145P ic taken from a Nakamichi Cassette deck 1.5 service manual. Hope it helps.
