Dallas RangeBlaster

Started by PNG123, November 03, 2006, 03:49:51 AM

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PNG123

Hello Every body,

I am shopping for some compontents for the Dallas RangeBlaster (a modification of the RangeMaster)
Here are the list of stuff;

Dallas Rangemaster/Blaster(http://fuzzcentral.tripod.com/rangemaster.html)
 
Resistors 
Resistor part numbers are for 1%, 1/4-watt metal film resistors 
1 - 1M, 271-1.0M 
1 - 470K, 271-470K 
1 - 68K, 271-68K 
1 - 3K9, 271-3.9K

Potentiometers 
1 - 10K audio taper pot, 16mm, 313-1500-10K

Capacitors 
2 - 47µF electrolytic, 140-XRL25V47 
1 - 0.01µF polyester film, 140-PM2A103K 
1 - 0.005µF polyester film, 140-PM2A502K 


Transistors 
1 - 2N388A NPN Germanium, hfe=80, Personal Stash

Diodes 
1 - 1N34A Germanium, Small Bear Electronics (www.smallbearelec.com)
1 - 1N4001, 625-1N4001 
1 - Red super-bright LED, Water clear lens, 351-5100
(+1K resistor)

Other Parts
1 - Hammond 1590BB aluminum enclosure, 546-1590BB 
1 - Switchcraft enclosed stereo input jack, 502-N112B 
1 - Switchcraft enclosed mono output jack, 502-111 
1 - 3PDT Stomp Switch, Aron Nelson (http://www.diystompboxes.com/cart/
1 - DC Power Jack with N/C Switch, Plastic body, 163-4302 
1 - 24 gauge white stranded hook-up wire 100 foot spool (many effects!),
1 - Plastic knob, 1.45" dia., 45KN021 
1 - Solderless LED Connector (built-in 2K2 resistor), 593-CNX310220 
1 - LED mounting clip, 2-piece, 351-0002 
1 - Battery snap, 6" leads, 123-5116
4 - 3M stick-on rubber feet, black, 517-SJ-5012BK

---
Now i have some problems, let me start;
I shop from Small Bear and Banzai (though still gathering stuff).
Starting with Banzai;

1) It says i need ;1%, 1/4-watt metal film resistors 
Now all banzai have are ;http://www.banzaieffects.com/Resistors-c-564.html
I selected the 0,6W watt ones,
Are these ok?

2) When choosing the 0,6 metal film  resistors i couldn't find a 3.9k so i got it Carbon Film, is this ok?

3) Capacitors;
Those 0.01uf = 10nf?

Also which caps are polyester-film ? (http://www.banzaieffects.com/Film-Foil-c-566.html)

4) Pots
Audio Taper = Log,  Right?

5)
1 - 2N388A NPN Germanium, hfe=80, Personal Stash

Aha, Hard to find :(,
Would this do; http://www.banzaieffects.com/Selected-AC128-transistors-pr-16288.html ???

6) Do i need the Solderless LED conector ? or the LED mounting Clip?


smnm

#1
1) It says i need ;1%, 1/4-watt metal film resistors 
Now all banzai have are ;http://www.banzaieffects.com/Resistors-c-564.html
I selected the 0,6W watt ones,
Are these ok?
yep

2) When choosing the 0,6 metal film  resistors i couldn't find a 3.9k so i got it Carbon Film, is this ok?
yep again


3) Capacitors;
Those 0.01uf = 10nf?
Yup
I have to check these every darn time though:

http://www.radio-electronics.com/info/data/capacitor/capacitor_conversion_chart.php

Also which caps are polyester-film ? (http://www.banzaieffects.com/Film-Foil-c-566.html)
They're the blocky ones you see on a lot of commercial effects - see
http://www.banzaieffects.com/MKT-Standard-5mm-c-432.html


4) Pots
Audio Taper = Log,  Right?
Yeah

5)
1 - 2N388A NPN Germanium, hfe=80, Personal Stash ...

A lot of different NPN germanium transistors work in this type of circuit and are still around but relatively expensive compared to modern PNP transistors - I've used OC44, OC71, NTE102  but there are many more - buy a few different ones and use a socket, as they all sound different. The Banzai AC128 should be good - I haven't tried one in this kind of of circuit, but I've used the 3 I mentioned in 3 different Rangemaster-type boosters I've built. If you're getting your 3p3t stompswitch from Aaron , he also has some OC140s that'll do the job.

6) Do i need the Solderless LED conector ? or the LED mounting Clip?
If you use the solderless connector it includes the resistor that you normally have to add to reduce the voltage going to the LED, so it's easier to deal with. I don't use LEDs much though. If you can tell it's on, it's not necessary IMO.

.... the Rangemaster is a really cool thing, I use mine a lot, but it's designed to use with older amps which have a 'darker' sound - it can sound a bit shrill through a bright modern amp - just takes a bit of getting used to. Good luck!

rockgardenlove

I think all your questions got covered.

With that DC jack, remember that it is positive ground.  I kind of automatically start wiring up for PNP usage, and then I realize I have the negative grounded.

With the Rangemaster I especially like being able to use a pot to pan between two different input capacitors to control the boosted frequencies.  As I let more and more bass through it gives it some grit; a nice touch.

Just some ideas.



smnm

Just FYI, PNG123, I tried an AC188 (similar to AC128) in my choose-between-several-input-capacitors Rangemaster today and I liked it a lot - sort of a hollow glassy sound.

Torchy

Why are you lot recommending PNP Ge trannies when the RangeBlaster project calls for NPN and is neg ground ? From the questions asked, I think the OP is quite new to this and it should be pointed out.

If you want it neg ground as per the Fuzzcentral project then these are easily available :-

AC127
AC187
AD161
OC140 - personally I think the best choice. If you find the gain too high, just flip the c and e.


smnm

tsk - there was a trick in the question - ok, I didn't look at the fuzzcentral schematic, talk of AC128 etc. Thanks for pointing it out.
So - back to original question - no, Banzai AC128 won't work.

PNG123

:(,

So should i stick to the original RangeBlaster,
It is so darn hard to find parts at banzai.

Also would someone be kind enough to explain the difference between positive and negative DC jack thingy :S.

I am still a noob and wire projects like aron wired the 'begginer's project' In the project forum.