开云体育

SMD transistors for Alice/Schoeps

jack All Messages By This Member #37108 Hi All, Happy new year (if it’s not too late to say it!) Any thoughts on SMD replacements (or improvements!) on the through hole 2N5087? I’m looking to squeeze eight or more circuits onto a single board, so the smaller the better. Any ideas greatly received Cheers Jack
Jules Ryckebusch All Messages By This Member #37109 Sadly that one is obsolete with through hole ones still available. I’ve switched everything over to the OPA circuit. Best Regards, Jules Ryckebusch toggle quoted message Show quoted text On Jan 19, 2025, at 16:43, jack via groups.io <jackreynolds100@...> wrote: 2N5087
Scott Helmke All Messages By This Member #37110 I was doing PF5102 to replace the on5087, but those are also EOL. You could just try collecting all the major specs from the PF5102 and plugging those into the search on Mouser or Digi-Key.? I don't think anything is really going to be magic anymore, modern FETs are very good. -Scott toggle quoted message Show quoted text On 1/19/25 16:43, jack via groups.io wrote: Hi All, Happy new year (if it’s not too late to say it!) Any thoughts on SMD replacements (or improvements!) on the through hole 2N5087? I’m looking to squeeze eight or more circuits onto a single board, so the smaller the better. Any ideas greatly received Cheers Jack -- ---- Scott Helmke ---- scott@... ---- (734) 604-9340 ---- "I have ceased distinguishing between the religious and the secular, for everything is holy" - Joe Henry
Scott Helmke All Messages By This Member #37111 Heh.? Haven't looked that circuit in a while, I guess. 2N5087 is the PNP output stage. Same thing applies, though - probably a lot of transistors will work just fine, I've done this on other things where I had to substitute a new part. -Scott toggle quoted message Show quoted text On 1/19/25 16:53, Scott Helmke wrote: I was doing PF5102 to replace the on5087, but those are also EOL. You could just try collecting all the major specs from the PF5102 and plugging those into the search on Mouser or Digi-Key.? I don't think anything is really going to be magic anymore, modern FETs are very good. -Scott On 1/19/25 16:43, jack via groups.io wrote: Hi All, Happy new year (if it’s not too late to say it!) Any thoughts on SMD replacements (or improvements!) on the through hole 2N5087? I’m looking to squeeze eight or more circuits onto a single board, so the smaller the better. Any ideas greatly received ? Cheers Jack -- ---- Scott Helmke ---- scott@... ---- (734) 604-9340 ---- "I have ceased distinguishing between the religious and the secular, for everything is holy" - Joe Henry
jack All Messages By This Member #37112 Can you use the opamp circuit with electrets with built in FETs? 07889727365 02036861372 3 Swimmers Lane Haggerston London E2 8FR toggle quoted message Show quoted text On Sun, 19 Jan 2025 at 22:51, Jules Ryckebusch via <ryckebusch=[email protected]> wrote: Sadly that one is obsolete with through hole ones still available. I’ve switched everything over to the OPA circuit. Best Regards, Jules Ryckebusch > On Jan 19, 2025, at 16:43, jack via <jackreynolds100=[email protected]> wrote: > > 2N5087
Jules Ryckebusch All Messages By This Member #37113 开云体育 You could but I highly recommend the simple P48 if you need to go really small. It works really well. Best Regards, Jules Ryckebusch? toggle quoted message Show quoted text On Jan 19, 2025, at 17:47, jack via groups.io <jackreynolds100@...> wrote: ? Can you use the opamp circuit with electrets with built in FETs? 07889727365 02036861372 3 Swimmers Lane Haggerston London E2 8FR On Sun, 19 Jan 2025 at 22:51, Jules Ryckebusch via <ryckebusch=[email protected]> wrote: Sadly that one is obsolete with through hole ones still available. I’ve switched everything over to the OPA circuit. Best Regards, Jules Ryckebusch > On Jan 19, 2025, at 16:43, jack via <jackreynolds100=[email protected]> wrote: > > 2N5087
@jp8 All Messages By This Member #37114 Edited My favourite PNPs for the output stage are the Nexperia BCM53DS and BCM857DS. ? Double, factory matched pair. No more hand picking of pairs with matching Vbe and Hfe required. ? Jan
Jerry Lee Marcel All Messages By This Member #37115 开云体育 BCM53DS seems particularly interesting, since it has a large geometry (related to the 1A max current). Quite often, these medium-power transistors have very low noise at currents of about 1-2 mA, although manufacturers don't advertise it. If they did, they would have to QC it, which adds to the cost. Le 20/01/2025 à 08:00, j.postma8 via groups.io a écrit?: toggle quoted message Show quoted text [Edited Message Follows] My favourite PNPs for the output stage are the Nexperia BCM53DS and BCM857DS. ? Double, factory matched pair. No more hand picking of pairs with matching Vbe and Hfe required. ? Jan
@jp8 All Messages By This Member #37116 And it also has the best Hfe matching, btw. ? I always pair the BCM53DS with a BCM56DS (NPN pair) to form a? CFP output for reduced THD and improved CMRR. ? Jan
Richard Lee All Messages By This Member #37117 Jack, practically ANY small signal 'LN' pnp will do. ? I have a liking for 'small' power stuff like Jerry & jp8 but the rest of your circuit must be super for this to have even 0.1dB effect on noise. ? Higher voltage devices allow you to use plain 1n914/4148 instead of Zeners across them.? But don't leave the diodes out as their most important task is to protect the b-e junctions.

Previous Topic Next Topic