Akashic Guitar effects PCB lookup
ATTACKDECAYRANGERESONANCESPEED

1590BB · 5 knobs

PCB Guitar Mania

Master Sampler & Hodler

Based on the Maestro FSH-1 Filter Sample/Hold High, total 74 components

Category
Tremolo· Modern version of the classic 70s Dual Op Amp, Quad Op Amp
Controls
Attack · Decay · Range · Resonance · Speed
Difficulty
Advanced
Price
€11.90out of stock

Heads up Builders widely report inconsistent quality from PCB Guitar Mania boards, and whether a given board works is a gamble. Read recent forum reports before ordering.

From the vendor

Project overview

The Maestro Sample/Hold from the early to mid-70s is one of Tom Oberheim’s more interesting effects. It features not only vibrato and tremolo but also rhythms with added patterns that can be far beyond typical. The filter is a classic low pass that sounds incredibly smooth, and the controls allow you to tweak the rate of the sample/hold as well as the frequency of the filter.

Our Master Sampler & Hodler is a clone that maintains the original’s soul and offers modern versatility by adding three potentiometers and a Reverse Sweep Switch.

You should watch some of the many demos out there to get a taste of what this pedal can do!

Introduction

When we think about the pedal’s history, it’s quite amazing that just a handful of manufacturers carried the pedal industry on their backs. Electro-Harmonix and MXR usually get credit for their contributions but one company often forgotten is Maestro, which with products like “the FSH-1 Filter Sample/Hold,” made a huge impact on the music enterprise.

This pedal is two-in-one, with the option between Envelop Filter and Sample/Holp. When Filter is selected, the pluged instrument automatically activates an envelope follower that contours the modified low pass filter’s response curve according to the dynamics of the input. This gives a controllable dynamic effect that’s slightly more subtle than an “auto WAH”.

In the Sample/Hold position, the filter’s response is controlled randomly, but with an overlying rhythmic element determined by the controllable LFO (Speed control).

Controls

Potentiometers

• Filter Range: This controls the sensitivity of the envelope follower to picking dynamics as it is turned clockwise.

• Attack: This controls the intensity of the envelope attack as it is turned clockwise.

• Decay: This controls the time decay of the envelope/swept filter as it is turned clockwise.

• Resonance: This controls the filter resonance from dark and full to thin and resonant.

• Speed: Controls the speed of the sample/hold effect.

• T1, T2: These trimmers (inside the pedal) are used to adjust the Sample and Hold function behavior.

Switches

• Filter Sample/Hold: Switches between Envelope Filter or Sample/Hold modes.

• Reverse Sweep: reverses the direction of the sweep.

The Attack, Filter, and Decay controls work only in Filter mode. They do not influence the Sample and Hold. However, the Resonance control works in both modes. It is less significant in Sample/Hold, but it will produce a rang

Schematic

The schematic is in the vendor's build document, page 5. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 73 rows

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RefValueNormalizedTypeNotes
Resistors 39
R36470R470
R376k86.8k
R110k10k
R38470R470
R2100k100k
R391M1M
R322k22k
R4100k100k
R53k33.3k
R622k22k
R712k12k
R8100k100k
R9100k100k
R103k33.3k
R113k33.3k
R1222k22k
R13330R330
R1410k10k
R151M1M
R1622k22k
R1712k12k
R18120k120k
R19120k120k
R20120k120k
R21180k180k
R2222k22k
R232M72.7M
R241M1M
R25100k100k
R26100k100k
R271M1M
R2822k22k
R291M1M
R30330k330k
R313k33.3k
R3222k22k
R3347k47k
R343k33.3k
R35100k100k
Capacitors 15
C147n47n
C2150n150n
C31n1n
C433n33n
C6150n150n
C747n47n
C847n47n
C9150n150n
C10150n150n
C54u74.7u
C11220u220u
C12220u220u
C13220u220u
C14220u220u
C1510u10u
Diodes 4
D11N41481N4148
D21N41481N4148
D31N41481N4148
D41N58171N5817
Transistors 5
Q22N54572N5457
Q32N39062N3906
Q42N39042N3904
Q52N54572N5457
Q62N54572N5457
ICs 3
IC1LM13700NLM13700N
IC3LM324LM324
IC47660SPCA7660SPCA
Potentiometers 5
ATTACKB5KB5kPotentiometer
DECAYB1MB1MPotentiometer
RANGEB100KB100kPotentiometer
RESONANCEB1MB1MPotentiometer
SPEEDB1MB1MPotentiometer
Trimmers 2
TRIM1100K100kTrimmer
TRIM210K10kTrimmer