2SA733 "K"
Moderators: altitude, adafruit_support_bill, adafruit, phono, hamburgers
Please be positive and constructive with your questions and comments.
-
- Posts: 186
- Joined: Sun Jun 19, 2005 8:51 pm
2SA733 "K"
The datasheet lists K version as having a gain from 300-600. Perhaps these could make a substitute for the ap's ?
- braw
- Posts: 22
- Joined: Fri May 27, 2005 7:59 pm
It looks like the CSA733k is the one you're referencing.
http://www.chipdocs.com/pndecoder/number/733.html
http://www.chipdocs.com/pndecoder/number/733.html
-
- Posts: 12151
- Joined: Thu Apr 06, 2006 4:21 pm
Re: 2SA733 "K"
this is a pretty good idea. you should try ordering a few and see what its like!moogah wrote:The datasheet lists K version as having a gain from 300-600. Perhaps these could make a substitute for the ap's ?
- braw
- Posts: 22
- Joined: Fri May 27, 2005 7:59 pm
Here's a datasheet:
http://www.cpcares.com/pdf/2SA733K.PDF
It does look as though it's rated for 300-600 and the 2SA733p's are rated for 200-400. I just ordered some and am interested in the sound differences.
http://www.cpcares.com/pdf/2SA733K.PDF
It does look as though it's rated for 300-600 and the 2SA733p's are rated for 200-400. I just ordered some and am interested in the sound differences.
- braw
- Posts: 22
- Joined: Fri May 27, 2005 7:59 pm
I got them here:
http://www.cpcares.com/BipolarTransistor/2SA733K.html
Hopefully they have a good deal of stock. If these work well, they're gonna be gone soon.
http://www.cpcares.com/BipolarTransistor/2SA733K.html
Hopefully they have a good deal of stock. If these work well, they're gonna be gone soon.
- braw
- Posts: 22
- Joined: Fri May 27, 2005 7:59 pm
So here's the deal. I have the kit and haven't started assembling it yet. I have 100 2SA733p's from Mouser, and 25 2SA733k's in transit. What I would like to do is do a 3 way side by side with "standard" gain 733p's, high gain 733p's and high gain 733k's.
To do this I think I should socket the transistors. I'm wondering if there are sockets for this or if it's possible to "dremmel" a standard SIP socket for this. I really want to do the same pattern and similar filter sweeps to document the difference.
I think it will either be possible to create a 303 clone that surpasses the original in the areas that it excelled in, or a sick duck sounding monosynth that should be put to rest.
To do this I think I should socket the transistors. I'm wondering if there are sockets for this or if it's possible to "dremmel" a standard SIP socket for this. I really want to do the same pattern and similar filter sweeps to document the difference.
I think it will either be possible to create a 303 clone that surpasses the original in the areas that it excelled in, or a sick duck sounding monosynth that should be put to rest.
I used sip strip cut to length, maplin does it order code dc17t, trim it down and it fits perfectly. I socketed all my IC's and all the crucial transitors to facilitate easy modding/tweaks/repairs etc.
Re the "K" binned part I thought of this also but for accuracy you would want to go for the lower range beta (325-400) else it could affect the waveshape, I have not tried it yet as I have not found a source in the UK but when I do I'll post my findings here.
Re the "K" binned part I thought of this also but for accuracy you would want to go for the lower range beta (325-400) else it could affect the waveshape, I have not tried it yet as I have not found a source in the UK but when I do I'll post my findings here.
- subatomic
- Posts: 523
- Joined: Wed May 11, 2005 3:12 pm
thanks for bringing science into this. I look forward to hearing the results. Also, post your luck with the 733k's, how many you had to run through before you had a few around 340-400. Looks like they're a little pricey compared to the 733p's so I'd like to minimize my order.braw wrote:I really want to do the same pattern and similar filter sweeps to document the difference.
- braw
- Posts: 22
- Joined: Fri May 27, 2005 7:59 pm
Well what the BANNED?? I finally got my order for 2SA733k's and they are labeled 733y-105 on them and what looks like a white out mark on the back. The pin configuration seems different from the 733p's. Normally it's flat side down, left to right, E C B. These seem to only read with flat side up left to right as C B E, and the gains are all under 200.
I can't seem to find much info online as to what these are. Anyone??
I can't seem to find much info online as to what these are. Anyone??
- controlvoltage
- Posts: 242
- Joined: Tue Aug 09, 2005 12:17 am
your datasheet shows typical gain 200, max 600... if typical = average, then this just means the hFE is much less consistent then for the standard part, and an average must be a mean value for all parts, meaning hFE of <200 plenty of the time. It could just be that your sample batch is too small to find any high-gain standouts.
As for the different parts code/pinout... well that's another kettle of different-colored horses...
As for the different parts code/pinout... well that's another kettle of different-colored horses...
- braw
- Posts: 22
- Joined: Fri May 27, 2005 7:59 pm
Agreed. I called the place and the guy straight up said to send them back. I asked if it was for refund or exchange, and he said refund. He said they just don't have the K's, only the Y's. I can only assume there was an attempt to hoodwink me. Both the purchase order and the bag showed K's.
Damn electronic hooligans. I did find another source that I can only hope will send me that part I actually ordered.
Damn electronic hooligans. I did find another source that I can only hope will send me that part I actually ordered.
Please be positive and constructive with your questions and comments.