Mega problem with resistors - Page 1
Forum section: electronics / projects

author: PerranOak
author_rank: Frequent Contributor
timestamp: July 15, 2020, 04:57:47 pm
content: Recently, while dealing with oscillators, I realised that I only have 1MOhm resistors at this high value.I've looked into getting a few in the MOhm range: 1.5, 2.2, 3.3, 4.7, 6.8, 10 but buying them separately is a pain and pricey.Does anyone know of a convenient batch of assorted resistors of this high value anywhere ... even eBay?Cheers.

author: themadhippy
author_rank: Super Contributor
timestamp: July 15, 2020, 05:07:22 pm
content: Quotetry cpc,around a quid for 100 of each value

author: OM222O
author_rank: Frequent Contributor
timestamp: July 15, 2020, 06:58:30 pm
content: Mouser, digikey, rs components, all have them for cheap. Even a reel of 2500 won't be "pricy" for the volume.

author: Vovk_Z
author_rank: Super Contributor
timestamp: July 15, 2020, 11:10:20 pm
content: Quote from: PerranOak on July 15, 2020, 04:57:47 pmI bought mine on eBay. They are good enough. Google for "Resistor kit". Look for 2000 pcs or more.For example, metal film, through-hole.And, if you need SMD/SMT, thenHere it is, 0805.- I got 0805 and 1206 book kits. Those book kits are very convenient.Unlike semiconductors we may buy resistors from China surely.

author: ledtester
author_rank: Super Contributor
timestamp: July 16, 2020, 01:43:17 am
content: Quote from: Vovk_Z on July 15, 2020, 11:10:20 pmBut the OP wants values > 1 Mohm.I've run into the same problem - I think there is a niche market for high-resistance resistor packs.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: July 16, 2020, 01:50:40 am
content: Quote from: ledtester on July 16, 2020, 01:43:17 amFor sure! High value resistors are more of a vacuum-tube era thing...

author: PerranOak
author_rank: Frequent Contributor
timestamp: July 16, 2020, 02:52:47 pm
content: Cheers all.

author: golden_labels
author_rank: Super Contributor
timestamp: July 16, 2020, 03:30:02 pm
content: If you have limited budget and hobbyist projects are on your mind, I would simply skip some values and compose them from lower resistances. You do not need 2.2MΩ, you can use 2× 1MΩ. This way you can buy in 100s. If you are not constrained by space or having specific requirements about inductance, I see little reason to have exact-valued resistors. Even in professional setup it may be better for BOM optimization to go for some common values.I don’t know how shipping looks like after Brexit, but you may look at what TME offers:1/4W carbon THTsstart at 0.70 GBP/100pcs,1/2W metal film THTsstart at 2.68 GBP/100pcs.You may also find some fellow hobbyists locally, order larger quantity of various values and split the costs.

author: tooki
author_rank: Super Contributor
timestamp: July 16, 2020, 04:42:41 pm
content: Quote from: PerranOak on July 15, 2020, 04:57:47 pmWhy not just add a few to your next Digi-Key/Mouser/Farnell order? They don’t cost that much...

author: Kirr
author_rank: Regular Contributor
timestamp: July 17, 2020, 08:16:25 am
content: This:Quote from: golden_labels on July 16, 2020, 03:30:02 pm+ this:http://kirr.homeunix.org/electronics/resistor-network-finder/Can get you quite far, especially for a hobby project.

author: exe
author_rank: Unknown
timestamp: July 17, 2020, 08:51:54 am
content: I just buy kits like this:https://www.aliexpress.com/item/32370322093.html. I have 0805, 0603 and TH 1/4W kits. I wouldn't use them in precise circuits, but for general stuff they work great. Just don't forget to measure the actual value smd tweezers before use (just in case, never got wrong value in my kits, but sometime I read smd code incorrectly).

author: ledtester
author_rank: Super Contributor
timestamp: July 17, 2020, 10:08:14 am
content: Some aliexpress/ebay vendors are eager to get your business and are willing to try to source special orders, so you might just ask around.Might not make sense in this case, but something to keep in mind.

author: PerranOak
author_rank: Frequent Contributor
timestamp: July 17, 2020, 10:22:54 am
content: Fantastic advice all, thank you.