# Single supply rail to rail opamp uk? **URL:** \ **Category:** DIY STUFF\ **Created:** [June 24, 2021, 7:05pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682 "2021-06-24T19:05:43Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Unauthorised\_service](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/unauthorised_service/32/14978_2.png) [@Unauthorised\_service](https://lookmumnocomputer.discourse.group/u/Unauthorised_service)\ **Post date:** [June 24, 2021, 7:05pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/1 "2021-06-24T19:05:43Z")
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 👍 ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [June 24, 2021, 7:10pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/2 "2021-06-24T19:10:56Z")
> [@FM VCO with Arduino (Hagiwo)](https://lookmumnocomputer.discourse.group/t/fm-vco-with-arduino-hagiwo/3566/6): > > 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](https://lookmumnocomputer.discourse.group/t/help-finding-rare-components/3540/4) 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)](https://lookmumnocomputer.discourse.group/t/fm-vco-with-arduino-hagiwo/3566/7): > > I guess I should have looked at [the schematics](https://note.com/solder_state/n/n88317851a4c7) before posting that comment grinning, because it turns out the opamp is only used to buffer [the filtered dual PWM output](https://sensorium.github.io/Mozzi/learn/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 … ---
**Author:** ![Unauthorised\_service](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/unauthorised_service/32/14978_2.png) [@Unauthorised\_service](https://lookmumnocomputer.discourse.group/u/Unauthorised_service)\ **Post date:** [June 24, 2021, 8:24pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/3 "2021-06-24T20:24:09Z")
Ta… any other input appreciated …6002 are scarce on eb\*y and a bit pricey from uk sellers ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [June 24, 2021, 9:44pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/4 "2021-06-24T21:44:17Z")
Any reason not to use ±12 V and TL071? Farnell has [MCP6002-I/P](https://uk.farnell.com/microchip/mcp6002-i-p/ic-op-amp-1-8v-1mhz-dual-pdip8/dp/1292245) in stock at £0.414 each. ([octopart.com](http://octopart.com) is your friend here.) ---
**Author:** ![handsomegenius](https://avatars.discourse-cdn.com/v4/letter/h/898d66/32.png) [@handsomegenius](https://lookmumnocomputer.discourse.group/u/handsomegenius)\ **Post date:** [June 25, 2021, 3:39am UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/5 "2021-06-25T03:39:19Z")
An AD8656 runs on 5v, has rail to rail output and good specs for audio ---
**Author:** ![Unauthorised\_service](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/unauthorised_service/32/14978_2.png) [@Unauthorised\_service](https://lookmumnocomputer.discourse.group/u/Unauthorised_service)\ **Post date:** [June 25, 2021, 7:29am UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/6 "2021-06-25T07:29:41Z")
Ok …I will go for mcp6002 surface mount with adapters for stripboard now Ive found an acceptable price. Thanks 👍 ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [June 25, 2021, 12:44pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/7 "2021-06-25T12:44:55Z")
What supplier would that be? At Farnell the SMD MCP6002 is only about £0.04 cheaper than the DIP. ---
**Author:** ![Unauthorised\_service](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/unauthorised_service/32/14978_2.png) [@Unauthorised\_service](https://lookmumnocomputer.discourse.group/u/Unauthorised_service)\ **Post date:** [June 25, 2021, 2:37pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/8 "2021-06-25T14:37:40Z")
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 ---
**Author:** ![TimMJN](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/timmjn/32/15227_2.png) [@TimMJN](https://lookmumnocomputer.discourse.group/u/TimMJN)\ **Post date:** [June 25, 2021, 3:23pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/9 "2021-06-25T15:23:03Z")
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. ---
**Author:** ![Switches\_and\_Chips](https://avatars.discourse-cdn.com/v4/letter/s/7bcc69/32.png) [@Switches\_and\_Chips](https://lookmumnocomputer.discourse.group/u/Switches_and_Chips)\ **Post date:** [June 25, 2021, 6:53pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/10 "2021-06-25T18:53:32Z")
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. ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [June 25, 2021, 7:27pm UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/11 "2021-06-25T19:27:58Z")
Again, if you have a ±12 V supply, you don’t need R2R. You could use a TL071. ---
**Author:** ![Unauthorised\_service](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/unauthorised_service/32/14978_2.png) [@Unauthorised\_service](https://lookmumnocomputer.discourse.group/u/Unauthorised_service)\ **Post date:** [June 26, 2021, 6:21am UTC](https://lookmumnocomputer.discourse.group/t/single-supply-rail-to-rail-opamp-uk/3682/12 "2021-06-26T06:21:50Z")
Thanks for info , appreciated 👍