Cgs synth

On 2005-09-30 21:01 +0100, Dave Kendall wrote:

> If you're starting out ordering components, it's worth thinking about
> what modules you are planning on building, working out a big parts
> list, and then ordering larger amounts to get bulk discounts. (saves
> on shipping/delivery too) Some components are used a lot - 100k
> resistors are very common, as are 10K and 1K. In bulk, 1% resistors
> can often be nearly as cheap as 5% resistors, so it's worth going for
> 1% if bulk buying. Other common items are 47K linear pots, 8, 14 and
> 16 pin IC sockets, 1N4148 diodes, 47K, 22K , 2K resistors and some
> other values, and TL072/TL074 op-amps. BC547 transistors are used a
> lot in CGS designs, and 0.1uF and 100uF caps are common.

For large quantities, check Mouser. They may turn out less
expensive than Farnell, even if you're in Europe. For one
thousand TL072 (ST), it's 0.21 USD/pc from Mouser vs. 0.34
EUR/pc from Farnell. There are other examples. Mouser sells
bulk resistors very cheap, 12 USD for an ammo pack of 1,000.

I second Dave's advice. If you were to build one of each of CGS'
and Oakley's modules plus three of Jim Patchell's modules and a
Tellun TLN-156 module, you would need about :

385 1k resistors
98 2.2k resistors
507 10k resistors
115 22k resistors
106 33k resistors
198 47k resistors
932 100k resistors

40 10kA pots
85 47kA pots
32 100kA pots

455 small decoupling caps (100 nF)
104 large decoupling caps (2.2-22 uF)

68 axial ferrite beads

445 1N4148

147 BC547

216 TL072

Unless you don't plan to build more than a few modules, 1k, 10k
and 100k resistors, 100nF caps, 1N4148 diodes and
BC547/548/549/550 transistors are things to buy by the thousand.

> As an example, in the UK, RS components are usually expensive, but
> when buying tubes of 25 ICs, they often work out way cheaper than
> alternative sources. In one case, it was cheaper to buy 25 op-amps in
> a tube than to buy 15 individually.

Yep. For CA3083, RS are a bit cheaper than Farnell (25 for the
price of 23). For most other things, RS is more expensive.

--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
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