Single supply rail to rail opamp uk?

[Unauthorised_service]

Hagiwo has just put up another arduino vco …so that is now 3 of the same schematic …only the code needs changed…so any recommendations for a cheap single supply rail to rail opamp in the uk…the ones hagiwo uses are a bit hard to find or expensive. Yes I believe I could reconfigure the circuit for 12v , burt again any recommendations . Thanks

[analogoutput]

FM VCO with Arduino (Hagiwo)

The magic’s pretty much in the Mozzi library, the code is pretty simple and is just adapted from a Mozzi example. Not to denigrate @HAGIWO’s work! @fredrik said elsewhere an MCP6002 ($0.36 at Mouser) should work in place of the NJM2732D ($2.58). It’d be even nicer if something from Tayda would work, but I don’t see any that are rail-to-rail input/output.

FM VCO with Arduino (Hagiwo)

I guess I should have looked at the schematics before posting that comment , because it turns out the opamp is only used to buffer the filtered dual PWM output, so if you have ±12 V you can power the opamp with that and use pretty much anything. If you only have +12 V, an LM358 could work as long as you only drive high impedance inputs, but in that case you might want to shift the input signal a bit to keep the output away from the minus rail (the LM358 is minus rail in, near minus …

[Unauthorised_service]

Ta… any other input appreciated …6002 are scarce on eb*y and a bit pricey from uk sellers

[analogoutput]

Any reason not to use ±12 V and TL071?

Farnell has MCP6002-I/P in stock at £0.414 each. (octopart.com is your friend here.)

[handsomegenius]

An AD8656 runs on 5v, has rail to rail output and good specs for audio

[Unauthorised_service]

Ok …I will go for mcp6002 surface mount with adapters for stripboard now Ive found an acceptable price. Thanks

[analogoutput]

What supplier would that be? At Farnell the SMD MCP6002 is only about £0.04 cheaper than the DIP.

[Unauthorised_service]

Im still to check the postage rates, sometimes a bit steep … not tried farnell. Ive recently got a couple of items from RS in the UK and willing to pay above rates once in a while , and at least its next day delivery.
Edit its £9.95 ouch

[TimMJN]

Not-so-fun-fact: synth DIY is not necessarily a cheap hobby. Cheaper than buying ready-made modules, sure. But quality parts tend to add up. Usually best to buy larger quantities from big suppliers.

[Switches_and_Chips]

I had the same idea today after seeing the latest Hagiwo video, from what I could fathom the following will be suitable single supply rail to rail.

TLV271 (Sop8) 5 for £2.45 AliExpress

MCP6232 (Sop8) 10 for £5.27 AliExpress

NJM2732E (Sop8) 10 for $7.20 EBay

Sop8 adaptor plates 20 for £1.99 EBay

Of course I have no idea if they fake (recently had a bad batch of TL074’s from EBay) but I thought it was worth the gamble.

[analogoutput]

Again, if you have a ±12 V supply, you don’t need R2R. You could use a TL071.

[Unauthorised_service]

Thanks for info , appreciated