Velleman K4004B - which chipamp ?

[ash_dac]

Hi,

Does anyone know which chipamp is in Velleman Kit K4004B ?

http://www.velleman-kit.com/download...ual_k4004b.pdf

[cpemma]

9-pin SIL, the case, 50W/8R, my guess would be TDA1514A. It's been discontinued by Philips (though it's still available from a few stockists). Perhaps Velleman have a stockpile.

edit: Guess they don't have a stockpile. Order Code: K4004 [ is obsolete ]

[ash_dac]

Originally posted by cpemma
9-pin SIL, the case, 50W/8R, my guess would be TDA1514A. It's been discontinued by Philips (though it's still available from a few stockists). Perhaps Velleman have a stockpile.

edit: Guess they don't have a stockpile. Order Code: K4004 [ is obsolete ]

Hi,

I was just looking at Rapid and they have just added a few Velleman kits.

[cpemma]

Originally posted by ash_dac

I was just looking at Rapid and they have just added a few Velleman kits.

They have indeed, including that one and not bad value for a stereo pair with the snazzy heatsinking included. A purist would argue the FB resistors are too far from the chips, but you could solder them across the pins.

The 4004 circuit is similar to the TDA1514A datasheet one, all pins doing the same job AFAICS so I'm sticking with my first guess.

Maplin did a 1514 kit, I've made two up, decent sound, though not as good a supply rejection spec as the NS Overture range.

Note the TDA1521 chip used in this 2x15W kit is also discontinued.

[ash_dac]

Originally posted by cpemma


They have indeed, including that one and not bad value for a stereo pair with the snazzy heatsinking included. A purist would argue the FB resistors are too far from the chips, but you could solder them across the pins.

The 4004 circuit is similar to the TDA1514A datasheet one, all pins doing the same job AFAICS so I'm sticking with my first guess.

Maplin did a 1514 kit, I've made two up, decent sound, though not as good a supply rejection spec as the NS Overture range.

Yeah 1514 seems good guess. I couldn't get pinouts to match any ST chips or LM chips.

I wanted to do a wirewrap gainclone...

[ash_dac]

Originally posted by cpemma


They have indeed, including that one and not bad value for a stereo pair with the snazzy heatsinking included. A purist would argue the FB resistors are too far from the chips, but you could solder them across the pins.

The 4004 circuit is similar to the TDA1514A datasheet one, all pins doing the same job AFAICS so I'm sticking with my first guess.

Maplin did a 1514 kit, I've made two up, decent sound, though not as good a supply rejection spec as the NS Overture range.

Note the TDA1521 chip used in this 2x15W kit is also discontinued.

I have looked at the tda1521 kit and considered building it but I'm not sure that the power supply capacitors are large enough (two 2200uf ) considering the tda1521 supply ripple rejection.

In the tda1521 datasheet the quiescent current with no load 18ma min, typically 40ma, maximum 70ma. Doesn't this seem a bit too variable ?

The td1521 distortion charts look ok.

[consort_ee_um]

You could try the TDA7265 a little known but good twin amp avaliable from futurlec