Guitar preamp for piezoelectric pickup (JFET input opamp only)

[n0th1n6]

Hi mga master, naghahanap ako ng magandang preamp na opamp base at pwedeng magamit sa piezoelectric pickup, parang ganto



Marami kasi akong nakita na gamit ang J201 or MFP102 at maganda ang reviews. Ang kaso, wala akong makita ng mga piyesa na to kaya opamp na lang gamitin ko. Marami naman sa google kaya lang baka me mga masters na natin na me subok ng design.

TIA

[tiktak]

J202 ang ginamit ko dati, meron sa e-gizmo

[Johannah Aleksandria]

Kabibili ko lang ng j201 sa rs ah, 26 pesos ang isa.
Pag guitar kasi ayaw ng opamp kahit jfet input, bipolar din nman ang output, maliban na lang cguro kung configure mo to operate in class A yung opamp.

[maldihtah13]

Piezo rin ba gamit sa beatbox?

[n0th1n6]

Nakalagay sa RS, out of stock/discontinued na yung J201. Kung meron sa gizmo, J202 na lang...

[Engr. Dacuycoy]

ano ba pinagkaiba nila

http://www.fairchildsemi.com/ds/MM/MMBFJ201.pdf

[n0th1n6]

^ Yan din yun. Sana meron sa Alexan

edit:
Sa element14 pala meron. Mura pa

[Johannah Aleksandria]

Nakalagay sa RS, out of stock/discontinued na yung J201. Kung meron sa gizmo, J202 na lang...

Last week lang yung order ko ah, nung sabado dumating. 10 pcs minimum.
Puro electric guitar kasi gamit ko kaya wala akong mairekomendang mganda para sa acoustic.
Dapat nga malinis ang pick-up at amplification nito.
Pwede na cguro kahit anong circuit nito kahit bipolar ang gamit dahil di nman maging distorted ang output ng amp.
Acoustic nman to, kailangan lang malinis

[n0th1n6]

Any suggestion sir. Opamp na nga lang sana ang gagamitin ko kasi meron na akong opa132 at op134. JFET input naman itong mga ito. Sa element14, 4.90 lang ang isang J201.

[efren]

how about using Germanium trannies? lots of positive reviews regarding this vintage transistor, others say it's the best thing next to tubes when it comes to guitar pre-amp, others especially the "rockers" type say it really "kicks A**"
Yeah rock on! makes me miss Jimi H.

[zrehtiek/keitherz]

^ germanium transistors are used in "fuzz" pedals such as fuzz face, zvex fuzz factory, etc.

[n0th1n6]

Sir efren, malamang magagawa ko na nga po ito. Dun sa first watt thread, ito talaga ang intention ko kaya ako nakiamot sa trannies. Pag nabuo ko i post ko agad maliban lang siguro sa video na tumutugtog ako hahaha (di kasi ako marunong)

[gorex]

I Like jimmy h little wings purple haze hey joe foxy lady all along the watchtower. he was using a white fender strat. but the placement of the strings were inverted on the machinehead since he was a left handed guitar virtouso. he uses fuzz tone and wah wah effects  in his voodoo child song . 

[insomartin]

Analog Accelerometer ok din. but less than 2-3 g's dapat. (in place of piezo) since bingi ang piezo sa low frequency.

related topic:
http://www.analog.com/library/analogdialogue/archives/43-02/mems_microphones.html

[Johannah Aleksandria]

how about using Germanium trannies? lots of positive reviews regarding this vintage transistor, others say it's the best thing next to tubes when it comes to guitar pre-amp, others especially the "rockers" type say it really "kicks A**"
Yeah rock on! makes me miss Jimi H.

I have the fuzz (tonebender) using germanium 2SB324 and i can say mganda nga ang tunog.
Hinalungkat ko pa sa tindahan yung tranny, dating gamit ng AM radio.
Stranger sa akin yung bigay nyang tunog at kung yun man ay comparable sa tube, then i think i'm hearing tube sound.

[efren]

but remember, guitar amps are quite different from hi-fi amps, same goes with their sonic character, especially those that use tubes...

[n0th1n6]

I plan on using this schematic



Pwede ba yan sir efren?

OT:

Sir di pa ako nakakadaan sa lbc. Txt ko po kayo pag naidaan ko na. Thanks

[TinTopHack]

but remember, guitar amps are quite different from hi-fi amps, same goes with their sonic character, especially those that use tubes...

I have been using this circuit for quite some time already. I have built 4 or 5 of this already but I replaced J201 with 2N5457 because 2N5457 has been easily available. But you might need to change the value of R3 and R2 due to higher Idss of 2N5457.

[pEN DoTA]

I have been using this circuit for quite some time already. I have built 4 or 5 of this already but I replaced J201 with 2N5457 because 2N5457 has been easily available. But you might need to change the value of R3 and R2 due to higher Idss of 2N5457.

sir, what are the possible values of R3 & R2?

[TinTopHack]

sir, what are the possible values of R3 & R2?

Sori ngayon ko lang na tingnan to.

Assuming your power supply is 9V, start with the values of R3 = 1K8 and R2 = 560R.
Measure the voltage at the drain and at the source. Vd should be around 5.4V and Vs should be around 1.7V. If not, check that Vsupply - Vd => 3V and Vd - Vs => 3V. The target is to get a +/-3V swing from the drain terminal.